Gnamptogenys, Roger, 1863

Camacho, Gabriela P., Franco, Weslly & Feitosa, Rodrigo M., 2020, Additions to the taxonomy of Gnamptogenys Roger (Hymenoptera: Formicidae Ectatomminae) with an updated key to the New World species, Zootaxa 4747 (3), pp. 450-476 : 452-462

Identification key to workers of Gnamptogenys in the New World

(Modified from Lattke et al. 2007; Lattke & Delsine 2016; and Dias & Lattke 2019)

1. In dorsal view, promesonotal suture well marked, totally interrupting dorsal mesosomal sculpture ( Fig. 1A ); in frontal view, frontal carina not expanded or, if expanded into frontal lobe, not completely covering all of base of scape, at least neck visible; in lateral view, petiolar spiracle facing ventrolaterally, not in depression......................................... 2

- In dorsal view, promesonotal suture absent to well-impressed but never interrupting dorsal mesosomal sculpture ( Fig. 1B ); in frontal view, frontal carina not expanded or, if expanded into frontal lobe, not completely covering base of scape, with at least neck visible; in lateral view, petiolar spiracle facing ventrolaterally, not in depression (also see third lug).............. 31

- In dorsal view, promesonotal suture absent to lightly impressed, never interrupting dorsal mesosomal sculpture ( Fig. 1C ); in frontal view, frontal carina expanded into a frontal lobe, covering all of scape base, including condyle and neck; in lateral view, petiolar spiracle facing ventrally, located in depression...................................................... 81

2(1). In dorsal view, vertex smooth and shiny, sometimes presenting faded striae or rugulae, but never costulate or heavily sculptured; in frontal view, scape not reaching or slightly surpassing the vertex margin, never by more than twice its larger diameter; in lateral view, petiolar node with semiparallel anterior and posterior margins, both forming approximate right angles with the dorsal margin........................................................................................ 3

- In dorsal view, vertex completely sculptured, with well-marked costulae; in frontal view, scape always surpassing the vertex margin; in lateral view, petiolar node with a single curved anterodorsal margin or anterior and dorsal margins separated by a blunt angle.......................................................................................... 9

3(2). In dorsal view, mesosomal dorsum totally sculptured, usually costulate or rugulose ( Fig. 2A )......................... 4 - In dorsal view, mesosomal dorsum with large smooth and shiny areas ( Fig. 2B )................................... 8 4(3). In dorsal view, segments I and II of gaster (abdominal segments III and IV) totally sculptured, costulate or rugulose...... 5 - In dorsal view, segments I and II of gaster (abdominal segments III and IV) smooth and shiny, sometimes with small striae at

the base of the hairs................................................................................... 7

5(4). In dorsal view, segment I of gaster (abdominal segment III) transversely rugulose; body yellowish. Brazil (PA) and Hispaniola

.............................................................................................. haytiana - In dorsal view, segment I of gaster (abdominal segment III) longitudinally costulate; body black to dark brown.......... 6

6(5) In frontal view, scape slightly surpassing the vertex margin; in lateral view, propodeal spiracle strongly projecting from integument, forming a tubuliform projection. Guyana..................................................... avus sp. n.

- In frontal view, scape not reaching the vertex margin; in lateral view, propodeal spiracle not projected. Bolivia, Brazil (AM, BA, PA), Colombia, Ecuador, French Guiana, Mexico, Peru and Venezuela........................................ mina

7(4). In frontal view, scape not reaching the vertex margin; metacoxal dorsum with a lobe or denticle; in dorsal view, segments I and II of gaster (abdominal segments III and IV) covered by small ridges or striae, extending from the base of the hairs. Brazil (MG, RS, SC, SP)..................................................................................... lavra

- In frontal view, scape slightly surpassing the vertex margin; metacoxal dorsum unarmed; in dorsal view, segments I and II of gaster (abdominal segments III and IV) completely smooth and shiny. Brazil (SC)......................... lenis sp. n.

8(3). In dorsal view, metanotal groove well-impressed, interrupting dorsal mesosomal sculpture; metacoxal dorsum unarmed; in lateral view, propodeal declivity lacking lobes; propodeal spiracle located directly on the declivity margin, elevated above the integument; in dorsal view, declivitous face of propodeum with transverse costulae. Brazil (AM, PA, MT, RO), Colombia, French Guiana, Guyana, Peru, Suriname and Venezuela................................................... relicta

- In dorsal view, metanotal groove absent; metacoxal dorsum with a lobe or denticle; in lateral view, propodeal declivity with anterolateral lobe; propodeal spiracle distant from declivity margin; in dorsal view, declivitous face of propodeum smooth and shiny, with some inconspicuous striae. Brazil (MG, PR, RJ, RS, SP, SC), Colombia and Venezuela........ reichenspergeri

9(2). In dorsal view, mesosomal dorsum with a well-defined metanotal groove ( Fig. 3A )................................ 10 - Metanotal groove absent ( Fig. 3B )...................................................................... 14

10(9). In dorsal view, segments I and II of gaster (abdominal segments III and IV) smooth and shiny. Colombia … gentryi

- In dorsal view, segments I and II of gaster (abdominal segments III and IV) longitudinally costulate ................... 11

11(10). In lateral view, subpetiolar process subquadrate, with a posterior angle......................................... 12 - In lateral view, subpetiolar process forming an anterior projecting lobe, without a posterior angle.................... 13

12(11). In dorsal view, area between promesonotal suture and metanotal groove narrow and of uniform width; anterior mesonotal margin convex. Belize, Brazil (PA), Colombia, Costa Rica, Ecuador, Mexico and Panama.......................... bisulca

- In dorsal view, area between promesonotal suture and metanotal groove wide and ovaloid; anterior mesonotal margin forms a blunt angle. Colombia......................................................................... dichotoma

13(11). In frontal view, anterior margin of clypeal lamella bluntly angular; in dorsal view, vertex longitudinally costulate. Colombia.

............................................................................................. brunnea - In frontal view, anterior margin of clypeal lamella evenly convex; in dorsal view, vertex with less than five transverse costulae.

Colombia and Panama........................................................................... auricula

14(9). In lateral view, petiolar node erect, the dorsal margin separated from the anterior and posterior margins by blunt angles ( Fig. 4A )............................................................................................... 15

- In lateral view, petiolar node posteriorly inclined, with a broadly curved anterodorsal margin contrasting with the angle separating the dorsal margin from the posterior margin ( Fig. 4B, C ).................................................. 18

15(14). In frontal view, scape longer than the total head length, surpassing the vertex margin by almost half its length; in frontal view, lateral margins of the head convex; in lateral view, dorsal face of mesosoma flat, without metanotal impression. Argentina, Bolivia, Brazil (widespread), Colombia, Ecuador, French Guiana, Paraguay, Peru, Suriname and Venezuela........ moelleri

- In frontal view, scape never longer than the total head length, surpassing the vertex margin by a third or less of its length; in frontal view, lateral margins of head subparallel to divergent, never convex; in lateral view, dorsal face of mesosoma convex, with or without metanotal impression.................................................................... 16

16(15). In frontal view, eye located in a depression in the head, the outer margin slightly surpassing the lateral margin of the head; scape very short, surpassing the vertex margin by 1 / 6 of its length; in lateral view, dorsal face of mesosoma completely convex, without metanotal impression. Brazil (BA, PA, PB, PE, PI, PR, RS, SE)..................................... pernambucana

- In frontal view, eye not located in a depression, the outer margin strongly surpassing the lateral margin of the head; scape length variable, surpassing the vertex margin by at least ¼ of its length; in lateral view, dorsal face of mesosoma convex with a visible metanotal impression................................................................................. 17

17(16). Scape covered by dense decumbent pilosity; in frontal view, several long, erect hairs projecting from the head dorsum, mandible and scape; in lateral view, dorsal meso and metasoma with relatively longer, erect, amber colored hairs; in dorsal view, propodeal declivity with 1-3 transverse costulae; in lateral view, subpetiolar process subquadrate or more often with an anteriorly projected lobe. Argentina, Bolivia, Brazil (widespread), Colombia, Costa Rica, Ecuador, El Salvador, French Guiana, Guyana, Guatemala, Hispaniola, Honduras, Jamaica, Lesser Antilles, Mexico, Nicaragua, Panama, Paraguay, Peru, Puerto Rico, Suriname, Trinidad and Tobago, Uruguay and Venezuela........................................... striatula

- Scape with sparse decumbent pilosity, not covering the entire structure; in frontal view head dorsum and mandible with short, stout, suberect hairs; in lateral view, dorsal meso and metasoma with relatively sparser, shorter, stout, suberect, white colored hairs; propodeal declivity devoid of transverse costulae; in lateral view, subpetiolar process subquadrate, without an anterior lobe. Brazil (MA), Guyana and Venezuela......................................................... ammophila

18(14). In lateral view, petiolar node with blunt or pointed apex overhanging the posterior margin ( Fig. 5A ); in ventral view, subpetiolar process with edges of mostly uniform width, widening only at the union with sternite.............................. 19

- In lateral view, petiolar node apex barely overhanging posterior margin ( Fig. 5B ); in ventral view, subpetiolar process cuneiform, anteriorly of uniform width, widening posteriorly into a bifurcate process …................................ 26

19(18). Petiolar node with an acute apex in lateral view. Bolivia, Brazil (AM), Colombia and Ecuador.................. .... acuta - Petiolar node with a blunt apex in lateral view .............................................................. 20

20(19). In dorsal view, vertex usually with 4–5 transverse costulae next to vertexal carina, extending across the width of the vertex ( Fig. 6A ); in ventral view, first gastral sternite with a median smooth and shiny area. Brazil (BA, MG), Colombia, French Guiana, Guyana, Suriname and Venezuela................................................................... gracilis

- In dorsal view, vertex usually without transverse costulae ( Fig. 6B ), or when transverse costulae are present, they are limited to the center of the vertex ( Fig. 6C ) or are not continuous across the vertex ( Fig. 6D ); in ventral view, first gastral sternite totally costulate or striate …................................................................................. 21

21(20). Scape with more than 10 long, erect hairs, not including underlying pubescence................................... 22 - Scape with fewer than 10 long, erect hairs, not including underlying pubescence ................................... 24

22(21). In lateral and dorsal views, body striate, sculpture relatively finer; in lateral view, body with dense pubescence under abundant erect hairs; dorsal margin of femur with erect to suberect hairs. Colombia.................................... pilosa

- In lateral and dorsal views, body costulate or striate, sculpture relatively coarser; in lateral view, body with sparse pubescence under erect hairs; dorsal margin of femur with decumbent to subdecumbent hairs …............................... 23

23(21). In dorsal view, body striate or costulate, with abundant decumbent pubescence; in lateral view, subpetiolar process forming a rounded lobe, without sharp angles; body and legs brown. Colombia....................................... ejuncida

- In dorsal view, body usually costate, with sparse decumbent pubescence; in lateral view, subpetiolar process usually with a sharp anterior angle, blunt in Central American specimens; body black and legs ferruginous. Bolivia, Brazil (MG, MS, MT), Colombia, Costa Rica, Ecuador, French Guiana, Guatemala, Honduras, Mexico, Nicaragua, Peru and Venezuela..... porcata

24(21). Scape and tibia with one or no semierect or semidecumbent hairs. Colombia and Ecuador......................... extra - Scape and tibia with five or more erect hairs ................................................................ 25

25(24). In dorsal view, propodeal declivity with transverse costulae; in lateral view, propodeal spiracle distant from the declivitous face of propodeum by at least the length of its opening; petiolar node slightly pedunculate. Bolivia, Brazil (widespread), Colombia, Ecuador, French Guiana, Lesser Antilles, Panama, Peru, Suriname, Trinidad and Tobago and Venezuela …...... pleurodon

- In dorsal view, propodeal declivity with longitudinal costulae; in lateral view, propodeal spiracle located closer than the length of its opening to the declivitous face margin; petiolar node sessile. Colombia …........................... nigrivitrea

26(18). In lateral view, propodeal dorsum depressed below level of mesonotum; dorsal and declivitous propodeal faces separated by a ridge; postpetiolar sternite with weakly-defined rugulae. Ecuador and Venezuela …............................ pittieri

- In lateral view, propodeal dorsum not depressed below level of mesonotum; dorsal and declivitous propodeal faces confluent; postpetiolar sternite with well-defined costulae or striae …................................................... 27

27(25). Scape with dense white pubescence and 0–2 erect hairs. Bolivia........................................... ilimani - Scape with moderate to sparse pubescence and dense decumbent pilosity, with five or more erect hairs ................. 28

28(27). Head with relatively smaller eyes (OI<0.16); in lateral view, dorsum of mesonotum and propodeum continuous, not separated by a metanotal impression; larger species (HW≥ 0.84 mm, WL≥ 0.35 mm) …..................................... 29

- Head with relatively larger eyes (OI ≥ 0.16); in lateral view, dorsum of mesonotum and propodeum separated by a metanotal impression; smaller species (HW<0.84 mm, WL<0.35 mm) …................................................ 30

29(28). In lateral view, subpetiolar process with a poorly developed fenestra. Bolivia................................ aspera - In lateral view, subpetiolar process with a well-developed fenestra. Colombia and Ecuador.................... … andina

30(28). In frontal view, vertex margin concave; in dorsal view, humerus rounded; in lateral view, propodeal dorsum depressed in relation to the mesonotal dorsum. Belize, Colombia, Costa Rica, Ecuador, French Guiana, Guatemala, Guyana, Honduras, Jamaica, Mexico, Nicaragua, Panama and Suriname …......................................................... strigata

- In frontal view, vertex margin straight; in dorsal view, humerus angulate; in lateral view, dorsum of propodeum and mesonotum continuous, propodeum not depressed relative to mesonotum. Brazil (BA) ............................. latistriata sp. n.

31(1). In frontal view, scape not reaching the vertex margin ( Fig. 7A ) ................................................. 32 - In frontal view, scape surpassing vertex margin by at least one apical width ( Fig. 7B ) ............................... 49 32(31). Mandibular dorsum with striae, costulae or rugulae on at least ¼ of its length ( Fig. 8A ) ............................. 33 - Mandibular dorsum totally smooth and shiny, with sparse punctuation ( Fig. 8B ).................................. 35 33(32). In frontal view, mandible falcate; body with irregular costulae. Hispaniola................................. falcaria - In frontal view, mandible triangular or semitriangular; body with regular striae or costulae …........................ 34

34(33). Mandibular dorsal surface densely striate; eyes small (OI<0.1); metacoxal dorsum unarmed. Argentina, Bolivia, Brazil (AC, AM, BA, GO, MG, MT, PA, RO, SP), Colombia, Costa Rica, Ecuador, French Guiana, Nicaragua, Panama, Peru and Venezuela........................................................................................ haenschi (in part)

- In frontal view, mandibular dorsal surface costulate on basal fourth or less, the rest smooth and shiny; large eyes (OI>0.2); metacoxal dorsum with a lobe. Argentina, Brazil (BA, PA), Colombia, Costa Rica, Guatemala, Guyana, Honduras, Mexico, Nicaragua, Panama, Peru, USA (TX, LA) and Venezuela......................................... hartmani (in part)

35(32). In dorsal view, propodeal dorsum mostly transversely striate ( Fig. 9A ) ........................................... 36 - In dorsal view, propodeal dorsum mostly longitudinally striate or costulate ( Fig. 9B ).............................. 38 36(35). Head less elongate (CI>0.78); body brown to dark brown.................................................... 37 - Head more elongate (CI<0.78); body black. Colombia, Costa Rica, Ecuador, Nicaragua and Panama............... alfaroi

37(36). In dorsal view, mesosoma and petiole costulate; both propodeum and metacoxal dorsum edentate. Brazil (AM, PA, MT), Colombia, Ecuador and Peru......................................................................... kempfi

- In dorsal view, mesosoma and petiole finely striate; both propodeum and metacoxal dorsum dentate. Bolivia, Brazil (AC, AM, AP, BA, MT, PA, PR, RJ, RO, RR, SP), Colombia, Costa Rica, French Guiana, Ecuador, Guyana, Honduras, Nicaragua, Panama, Peru, Suriname and Venezuela............................................................ annulata

38(35). In frontal view, clypeal lamella laterally rounded, never angular ( Fig. 10A ); in lateral view, subpetiolar process usually rounded,

rarely with a posterior tooth........................................................................... 39 - In frontal view, clypeal lamella with sharp lateral angles ( Fig. 10B ); in lateral view, subpetiolar process with a posterior tooth

.................................................................................................. 46 39(38). In frontal view, mandible triangular; in lateral view, metanotal groove absent. Argentina and Brazil (GO, PA, SP)..... nana - In frontal view, mandible semitriangular to semifalcate; in lateral view, metanotal groove well-defined................ 40

40(39). Metacoxal dorsum unarmed, at most with a low tubercle or swelling............................................ 41 - Metacoxal dorsum with a lobe or tooth................................................................... 43

41(40). In frontal view, clypeal lamella with a broad median concavity and laterally rounded; in ventral view, second gastral sternite sculptured; body costulate. Brazil (PR), Colombia, Costa Rica, French Guiana, Guatemala, Honduras, Jamaica, Mexico, Panama, Suriname and Venezuela.................................................................... interrupta

- In frontal view, clypeal lamella projecting medially, with a small median concavity, and laterally with blunt angles; in ventral view, second gastral sternite smooth and shiny, body striate or costulate......................................... 42

42(41). In frontal view, head with fewer than 20 striae between frontal carina; in lateral view, base of pro, meso and metapleuron smooth and shiny; body costulate. Colombia, Costa Rica and Panama..................................... andersoni

- In frontal view, head with more than 30 striae between frontal carina; in lateral view, base of pro, meso and metapleuron with longitudinal striae; body striate. Colombia and Costa Rica............................................... stellae

43(40). Metacoxal dorsum with a slender and parallel-sided lobe or tooth; HW> 1.12 mm, WL> 1.81 mm. Argentina, Brazil (AM, ES, GO, PA, PE, RJ, SP), Colombia, Costa Rica, Ecuador, French Guiana, Guyana, Honduras, Mexico, Nicaragua, Panama, Peru, Suriname, Trinidad and Tobago and Venezuela........................................................ mordax

- Metacoxal dorsum with a low triangular lobe; HW<1.12 mm, WL<1.81 mm ..................................... 44

44(43). In lateral view, propodeal spiracle separated from declivity by less than its diameter. Brazil (BA)................ wilsoni - In lateral view, propodeal spiracle separated from declivity by more than its diameter.............................. 45

45(44). In frontal view, head dorsum striate ( Fig. 11A ). Bolivia and Peru....................................... boliviensis - In frontal view, head dorsum costulate ( Fig. 11B ). Belize, Bolivia, Brazil (AM, BA, MG, PR, RJ, RR, SC, SE, SP), Colombia,

Costa Rica, Ecuador, French Guiana, Guyana, Honduras, Mexico, Panama, Paraguay, Peru, Suriname and Venezuela.......

............................................................................................. continua 46(38). Metanotal groove well-defined, visible in any angle; subpetiolar process without a posterior tooth.................... 47 - Metanotal groove weakly defined, visible only in limited angles; subpetiolar process with posterior tooth.............. 48

47(46). In frontal view, anterior margin of clypeal lamella straight; metacoxal dorsum with a lobe. Brazil (BA, RJ, SC)... rimulosa - In frontal view, anterior margin of clypeal lamella with a bluntly angular concavity; metacoxal dorsum unarmed. Panama...

............................................................................................. biquetra

48(46). In dorsal view, propodeal declivity with longitudinal costulae that converge posteriorly; anterior face of petiolar node transversely costulate; mesometapleural suture absent or weakly impressed. Argentina, Bolivia, Brazil (widespread), Colombia, Costa Rica, Ecuador, French Guiana, Guyana, Lesser Antilles, Panama, Peru, Suriname, Trinidad and Tobago and Venezuela............................................................................................... horni

- In dorsal view, propodeal declivity with parallel longitudinal costulae; most of anterior face of petiolar node longitudinally costulate, but frequently with a basal strip of transverse costulae that occasionally covers all of anterior face; mesometapleural suture well-impressed. Argentina, Brazil (widespread), Colombia, Costa Rica, Ecuador, French Guiana, Guyana, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Suriname and Venezuela................................... regularis

49(31). In frontal view, mandible falcate or semifalcate, with just the apex touching or overlapping the opposite mandible when totally closed ( Fig. 12A ).................................................................................... 50

- In frontal view, mandible triangular to elongate, with a fourth or more of the masticatory border overlapping the opposite mandible when closed ( Fig. 12B )........................................................................... 54

50(49). In lateral view, propodeal declivity with teeth or denticles; metacoxal dorsum with tooth; mostly continental species..... 51 - In lateral view, propodeal declivity rounded, without teeth or denticles; metacoxal dorsum unarmed; endemic to Hispaniola (see

also third lug)....................................................................................... 53 - In lateral view, propodeal declivity with teeth or denticles; metacoxal dorsum unarmed; endemic to Cuba.......... rumba

51(50). In frontal view, mandible with short triangular tooth on basal internal margin.................................... 52 - In frontal view, mandible with a lobe or broad convexity on basal internal margin. Brazil (AC, AL, AM, BA, CE, MG, PA, RJ)

and Ecuador.................................................................................. mediatrix

52(51). In frontal view, clypeus with a lobe anterior to each antennal fossa, each lobe partially covering the clypeal lamella; in lateral view, mesonotal spiracle in depression below level of surrounding integument. Ecuador..................... laticephala

- In frontal view, clypeus without lobes between antennal fossae and lamella; in lateral view, mesonotal spiracle at same level as surrounding integument. Colombia, Costa Rica, Ecuador, Panama and Nicaragua............................... banksi

53(50). In frontal view, mandible elongate and slender; propodeal dorsal surface with smooth transverse costulae. Hispaniola................................................................................................. … schmitti

- In frontal view, mandible shorter and thicker; propodeal dorsal surface with vermiculate longitudinal costulae. Hispaniola …............................................................................................ semiferox

54(49). In frontal view, mandibular dorsal surface mostly smooth and shiny, sometimes with striae or costulae extending to basal third;

mesosomal dorsum usually without transverse sutures, if otherwise, then the ant is ferruginous and finely striate …...... 55 - n frontal view, mandibular dorsal surface mostly striate or rugulose; metanotal groove well-impressed ….............. 68

55(54). Very large species (HW≥ 1.4 mm; WL≥ 2.3 mm) …......................................................... 56 - Smaller species (HW<1.4 mm; WL<2.3 mm) …........................................................... 57

56(55). In dorsal view, mesosoma costulate; metacoxa with dorsal tooth; in lateral view, apex of petiolar node ending in a blunt angle; body black. Brazil (AC, AM, PA, RO, RR), Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname and Venezuela............................................................................................. … tortuolosa

- In dorsal view, mesosoma striate; metacoxal dorsum unarmed; in lateral view, apex of petiolar node ending in a blunt point; body ferruginous. Bolivia, Brazil (AC, AM, AP, BA, MT, PA, RO), Colombia, Costa Rica, Ecuador, French Guiana, Panama, Peru and Venezuela ….......................................................................... concinna

57(55). In dorsal view, mesosoma striate; transverse crest, distinct from mesosomal striae, separating the propodeal dorsum from the propodeal declivity ( Fig. 13A ) .......................................................................... 58

- In dorsal view, mesosoma costulate; propodeal declivity and propodeal dorsum not separated by crest distinct from mesosomal striae ( Fig. 13B ) ….................................................................................. 59

58(57). Posterior face of petiolar node longitudinally costulate. Argentina, Brazil (BA, PA), Colombia, Costa Rica, Guatemala, Guyana,

Honduras, Mexico, Nicaragua, Panama, Peru, USA (TX, LA) and Venezuela …...................... hartmani (in part) - Posterior face of petiolar node transversely costulate. Argentina, Brazil (BA, RR, RS, SP) and Paraguay …......... bruchi

59(57). Posterior face of petiolar node longitudinally costulate ….................................................... 60 - Posterior face of petiolar node transversely costulate …...................................................... 64

60(59). In frontal view, clypeal lamella laterally angular; mandible elongate, the basal and masticatory margins separated by a broad convexity …....................................................................................... 61

- In frontal view, clypeal lamella laterally rounded; mandible triangular, the basal and masticatory margins separated by an angle............................................................................................. 63

61(60). In lateral view, petiolar node with a pointed apex; propodeal declivity longitudinally costulate; body uniformly brown. Bolivia, Brazil (widespread), Colombia, Costa Rica, French Guiana, Ecuador, Guyana, Panama, Peru, Suriname and Venezuela................................................................................................ acuminata

- In lateral view, petiolar node sometimes with a posterior projection but never pointed; propodeal declivity usually transversely costulate, rarely longitudinal; color variable, usually with both brown and ferruginous parts, rarely totally brown........ 62

62(61). Metacoxal teeth absent or vestigial; in lateral view, propodeal declivity without lateral lobes; body dark brown to bicolored. Argentina, Belize, Bolivia, Brazil (widespread), Colombia, Costa Rica, Ecuador, El Salvador, French Guiana, Guatemala, Guyana, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Suriname and Venezuela......................... sulcata

- Small metacoxal teeth present; in lateral view, propodeum with small lateral lobes; body yellow. Bolivia............ flava

63(60). In frontal view, clypeal lamella with two convexities; metacoxal dorsum with a lobe; in lateral view, petiolar node with dorsal and posterior margins forming approximately a right angle. Panama..................................... transversa

- In frontal view, clypeal lamella with a single convexity; metacoxal dorsum unarmed; in lateral view, petiolar node with an apical point that overhangs the posterior margin. Brazil (AM, PA), Colombia, Ecuador, Peru and Venezuela....... fernandezi

64(59). In frontal view, clypeal lamella laterally sharply angular..................................................... 65 - In frontal view, clypeal lamella laterally rounded or obtusely angular........................................... 66

65(64). HW<1.1 mm; WL<1.7 mm; in frontal view, clypeal lamella with a straight anterior margin. Bolivia, Brazil (AC, RO, MG), Colombia, French Guiana, Guyana and Venezuela....................................................... ericae

- HW> 1.1 mm; WL> 1.7 mm; in frontal view, clypeal lamella medially convex, laterally concave. Brazil (AM, RR), Colombia, Panama and Venezuela..................................................................... curvoclypeata

66(64). In frontal view, clypeal lamella straight medially and rounded laterally; mandible semitriangular, the basal and masticatory margins separated by a broad convexity; propodeal declivity longitudinally costulate.............................. 67

- In frontal view, clypeal lamella medially concave and convex laterally; mandible triangular, the basal and masticatory margins separated by an angle; propodeal declivity transversely costulate. Costa Rica............................... volcano

67(66). In lateral view, petiolar node with a more or less convex dorsal margin; metacoxal dorsum with an acute tooth; subpetiolar process with sharp angles. Brazil (BA, MG, PR, RJ, SC, SP)............................................. lucaris

- In lateral view, petiolar node with a straight dorsal margin; metacoxal dorsum with a triangular tooth; subpetiolar process with blunt angles. Venezuela......................................................................... siapensis

68(54). Scape usually smooth and shiny with sparse punctulae ( Fig. 14A )............................................. 69 - Scape rugulose or striate (sculpture sometimes attenuated) ( Fig. 14B ).......................................... 75 69(68). Mandibular dorsal surface striate or rugulose; metacoxal dorsum toothed....................................... 70 - Mandibular dorsal surface smooth and shiny; metacoxal dorsum unarmed. Hispaniola........................ insularis

70(69). Masticatory margin of mandible with distinct denticles...................................................... 71 - Masticatory margin of mandible edentate or with indistinct denticulation........................................ 72

71(70). In lateral view, propodeum unarmed; body striate. Brazil (AM, CE, RR), Hispaniola and Lesser Antilles......... lineolata - In lateral view, propodeum with denticles; body costulate. Colombia.................................... ingeborgae

72(70). In frontal view, scape surpasses vertex by at least twice apical width of scape; HW> 1.1 mm; WL> 1.6 mm ............. 73 - In frontal view, scape surpasses vertex by not more than apical width of scape; HW<1.1 mm; WL<1.6 mm. Argentina, Bolivia,

Brazil (AL, BA, PR, RJ, RS, SC, SP) , Paraguay and Peru............................................... rastrata

73(72). In dorsal view, petiolar node shorter than wide. Brazil (AP, PA), Colombia and Ecuador.......................... lanei - In dorsal view, petiolar node longer than wide............................................................. 74

74(73). In lateral view, propodeal tooth longer than diameter of propodeal spiracle; subpetiolar process projecting anteriorly as a triangular lobe. Brazil (PA), Colombia and French Guiana............................................ enodis (in part)

- In lateral view, propodeal tooth shorter than diameter of propodeal spiracle; subpetiolar process subquadrate. Brazil (BA, ES, MG, PA, PR, RJ, RS, SP) and Colombia............................................................. menozzii

75(68). Propodeal teeth absent. Argentina, Bolivia, Brazil (AC, AM, BA, GO, MG, MS, PA, RO, SP), Colombia, Costa Rica, Ecuador,

French Guiana, Nicaragua, Panama, Peru and Venezuela......................................... haenschi (in part) - Propodeal teeth present............................................................................... 76

76(75). In frontal view, eyes not prominent nor protruding, relatively flat; in dorsal view, anterior pronotal margin with longitudinal costulae. Argentina, Bolivia, Brazil (AC, AM, ES, GO, MT, PA, PR, SC, SP), Colombia, Costa Rica, Ecuador, French Guiana, Guyana, Panama, Peru, Suriname, Uruguay, USA (exotic in FL, AL, MS, TX) and Venezuela............... triangularis

- In frontal view, eyes prominent and protruding; in dorsal view, anterior pronotal margin with at least 5 transverse rugulae or costulae........................................................................................... 77

77(76). In dorsal view, vertex with 4–5 transverse costulae; anterior half of first gastral tergite rugose....................... 78 - In dorsal view, vertex longitudinally costulate; anterior half of first gastral tergite longitudinally costulate.............. 79

78(77). In lateral view, propodeal teeth at least as long as the distance between their bases; body ferruginous. Colombia, Costa Rica and

Panama..................................................................................... bispinosa - In lateral view, propodeal teeth short; body black. Brazil (PA), Colombia and Ecuador....................... perspicax

79(77). Dorsal face of propodeum transversely costulate. Costa Rica and Panama............................... cuneiforma - Dorsal face of propodeum longitudinally costulate.......................................................... 80

80(79). In dorsal view, pronotum longitudinally costulate; in lateral view, subpetiolar process rectangular. Bolivia, Brazil (AM, PA), Colombia, Costa Rica, Ecuador, French Guiana, Guatemala, Nicaragua and Panama.......................... mecotyle

- In dorsal view, pronotum with anterior strip of transverse costulae; in lateral view, subpetiolar process a modest lobe, without angles. Brazil (PA), Colombia and French Guiana............................................... enodis (in part)

81(1). Propodeum with a pair of denticles....................................................................... 82 - Propodeum unarmed................................................................................. 87

82(81). Integument mostly opaque, sculpturing predominantly granulose with variable degrees of areolae/foveolae ( Fig. 15A )... 83 - Integument mostly shiny or silky, sculpturing can be finely striolate or smooth with variable degrees of areolae/foveolae ( Fig.

15B).............................................................................................. 85 83(81). In frontal view, mandible falcate, masticatory margin edentate and concave. Venezuela......................... fieldi - In frontal view, mandible triangular, masticatory margin fairly straight and denticulate or crenulate................... 84

84(83). In lateral view, metanotal groove well-impressed; propodeum and petiole spiracles shiny and conspicuous. Venezuela.................................................................................................. petiscapa

- In lateral view, metanotal groove absent; propodeum and petiole spiracles opaque and not conspicuous. Belize, Bolivia, Brazil (widespread), Colombia, Costa Rica, Ecuador, French Guiana, Guatemala, Guyana, Mexico, Nicaragua, Panama, Peru, Suriname and Venezuela.............................................................................. minuta

85(82). Mandible falcate. Brazil (AC), Colombia, Ecuador, Peru and Venezuela................................... falcifera - Mandible triangular.................................................................................. 86

86(85). In frontal view, eyes not prominent, broadly convex; anterior clypeal margin broadly convex; occipital lobe rounded. Costa Rica, Ecuador, Guatemala, Honduras, Mexico, Nicaragua and Panama.................................... simulans

- In frontal view, eyes prominent, semispherical; anterior clypeal margin medially concave; occipital lobe sub-angular. Brazil (MT) and Ecuador................................................................................ vriesi

87(81). Meso and metatibial spurs absent. Argentina, Brazil (MA, MG, PA, PR, RO), Colombia, Paraguay and Venezuela... caelata - Meso and metatibial spurs present...................................................................... 88

88(87). In frontal view, clypeal lamella present; clypeus with a median tooth. Brazil (BA, MG, SC).................... striolata - In frontal view, clypeal lamella absent; clypeus with a median lobe. Brazil (RJ).................................. piei

Figures

FIGURE 1. Dorsal view of mesosoma, showing: A) promesonotal suture well marked, totally interrupting dorsal mesosomal sculputure (G. pleurodon—CASENT0281219); B) promesonotal suture well impressed, but not interrupting dorsal mesosomal sculpture (G. mediatrix—CASENT0281839); and C) promesonotal suture absent (G. minuta—CASENT0281213). Photos by Estella Ortega (A, C) and Shannon Hartmann (B) available from www.antweb.org.

FIGURE 3. Dorsal view of mesosoma, showing: A) promesonotal suture (1) and metanotal groove (2) (G. bisulca— CASENT0281521); and B) only promesonotal suture (1) (G. moelleri—CASENT0246692). Photos by Zach Lieberman (A) and Andrea Walker (B) available from www.antweb.org.

FIGURE 4. Lateral view of petiole, showing: A) anterior and dorsal margins of petiole separated by blunt angles (G. striatula—CASENT0106042); B, C) anterodorsal margin of petiole curved, no angle separating dorsal and anterior margins (G. porcata—CASENT0281222, G. strigata—CASENT0217487). Photos by Michael Branstetter (A), Estella Ortega (B) and Will Ericson (C) available from www.antweb.org.

FIGURE 5. Lateral view of petiole, showing: A) apex of petiolar node overhanging the posterior margin (G. porcata— CASENT0281222); and B) petiolar node apex not overhanging the posterior margin (G. pittieri—CASENT0281218). Photos by Estella Ortega available from www.antweb.org.

FIGURE 6. Dorsal view of head, showing A) transverse costulae extending across the width of the vertex (G. gracilis— CASENT0281525); B) vertex without transverse costulae (G. illimani—CASENT0179988); C) transverse costulae limited to the center of the vertex (G. pittieri—CASENT0281218); and D) transverse costulae not extending all across the vertex (G. porcata—CASENT0281222). Photos by Zach Lieberman (A), Erin Prado (B) and Estella Ortega (C, D), available from www. antweb.org.

FIGURE 7. Frontal view of head, showing: A) scape not reaching vertex margin (G. interrupta—CASENT0178679); B) scape surpassing vertex margin by at least one apical width (G. tortuolosa—CASENT0907192). Photos by April Nobile (A) and Will Ericson (B) available from www.antweb.org.

FIGURE 8. Frontal view of mandibles, showing: A) mandibular dorsum striated (G. haenschi—CASENT0281527); and B) mandibular dorsum smooth and shiny (G. annulata—CASENT0281514). Photos by Zach Lieberman available from www. antweb.org.

FIGURE 9. Dorsal view of mesosoma, showing: A) propodeum dorsum transversely striate (G. annulata—CASENT0217480); and B) propodeum dorsum longitudinally striate (G. stellae—CASENT0281227). Photos by Will Ericson (A) and Estella Ortega (B) available from www.antweb.org.

FIGURE 10. Frontal view of head, showing: A) clypeal lamella laterally rounded (G. stellae—CASENT0281227); and B) clypeal lamella with sharp lateral angles (G. regularis—CASTYPE00616). Photos by Estella Ortega (A) and April Nobile (B) available from www.antweb.org.

FIGURE 11. Frontal view of head, showing: A) head dorsum striate (G. boliviensis— CASENT0900556); and B) head dorsum costulate (G. continua—CASENT0178676). Photos by Ryan Perry (A) and April Nobile (B) available from www.antweb.org.

FIGURE 12. Frontal view of head, showing: A) falcate mandible (G. rumba—CASENT0179954); and B) semitriangular mandible (G. tortuolosa—ECOFOG-IT14-0450-23). Photos by Erin Prado (A) and Marta Soltysiak (B) available from www. antweb.org.

FIGURE 13. Dorsal view of mesosoma, showing: A) propodeal dorsum separated from propodeal declivity by a transverse crest (G. bruchi—CASENT0173382); and B) propodeal dorsum and declivity without crest (G. acuminata—CASENT0281511). Photos by April Nobile (A) and Zach Lieberman (B) available from www.antweb.org.

FIGURE 14. Frontal view of head, showing: A) scape smooth and shiny (G. rastrata—CASENT0281223); and B) scape with sparse sculpture (G. haenschi—CASENT0179994). Photos by Estella Ortega (A) and Erin Prado (B) available from www. antweb.org.

FIGURE 15. Frontal view of head, showing: A) integument opaque with granulose sculpturing (G. fieldi—CASENT0178675); and B) integument smooth and shiny, foveolate (G. simulans—CASENT0281522). Photos by April Nobile (A) and Zach Lieberman (B) available from www.antweb.org.

FIGURE2. Dorsalviewof mesosoma,showing:A) mesosomaldorsum completelysculptured(G.avus—USNMENT00413910); and B) mesosomal dorsum with smooth and shiny areas (G. relicta—USNMENT00412058). Photos by Jeffrey Sosa-Calvo available from www.antweb.org.