Lasioglossum (Dialictus) minckleyi, Gardner & Gibbs, 2020

Gardner, Joel & Gibbs, Jason, 2020, The ‘ red-tailed’ Lasioglossum (Dialictus) (Hymenoptera: Halictidae) of the western Nearctic, European Journal of Taxonomy 725, pp. 1-242 : 148-154

Lasioglossum (Dialictus) minckleyi sp. nov.

urn:lsid:zoobank.org:act:3197BF55-611C-4EE4-BC8B-4E133355826C

Figs 3A , 64–66 , 90J , 98B , 107B

Diagnosis

Females of Lasioglossum minckleyi sp. nov. can be recognized by the face short (length/width ratio ~0.8), frons and mesepisternum with coarse and crowded punctures (i =0 pd), clypeus with distinct apicolateral denticles, T1 anterior surface corarious, T2–4 with dark spiracular spots, metasomal terga lacking tomentum, and mesoscutum broad (length/width ratio usually ≤ 0.8). They are most similar to L. mesillense and L. imbriumbrae sp. nov. Both of these species usually have the frons and mesepisternum with finer or distinctly separated punctures at least in part, T1 anterior surface shiny, and metasomal terga with basolateral tomentum. Occasional specimens of L. mesillense lack some of these diagnostic characters, and are very difficult to distinguish from L. minckleyi sp. nov. Females of L. mesillense also have the mesoscutum longer (length/width ratio usually ± 0.84); this and the frons punctation seem to be the most reliable diagnostic characters.

Males of L. minckleyi sp. nov. can be recognized by the face short (length/width ratio ~0.83) and covered in moderately dense tomentum below the ocelli, flagellomeres relatively short (F2 about 1.6 times as long as F1 and 1.25 times as long as broad), mesepisternum punctures dense (i <1 pd), metasomal terga lacking tomentum, T1–3 rims punctate basally, and clypeus apical margin and labrum usually orange. They are most similar to L. mesillense , L. austerum sp. nov., and L. imbriumbrae sp. nov. Males of L. mesillense have the flagellomeres relatively long (F2 about 2 times as long as F1 and 1.6 times as long as broad), mesepisternum more sparsely punctate (i= 1–2 pd), and metasomal terga sometimes with basolateral tomentum. Males of L. austerum sp. nov. have the face below ocelli covered in sparser tomentum and mesepisternum more sparsely punctate (i ≤ 1 pd). Males of L. imbriumbrae sp. nov. have T1–3 rims impunctate and clypeus apical margin and labrum reddish brown to black.

Etymology

The specific epithet minckleyi is a dedication to Robert L. Minckley (University of Rochester), who collected the vast majority of currently known specimens. An appropriate translation would be Minckley’s sweat bee.

Material examined

Holotype

MEXICO – Sonora • ♀; Rancho San Bernardino, 28 km E of Agua Prieta, Hay Hollow riparian site; [31.31° N, 109.25° W]; 25 Aug. 2000; R. Minckley and A. Romero leg.; PCYU.

[Verbatim label: MEXICO: Sonora, Rancho San Bernardino,28kmE Agua Prieta 25Aug2000 Hay Hollow riparian Site / R Minckley, A Romero / ex. blue pan trap 003025 // 1849C01 // HOLOTYPE / Lasioglossum (Dialictus) minckleyi Gardner and Gibbs ]

Paratypes

MEXICO – Sonora • 1 ♀; 30 km E of Agua Prieta; 31.3217° N, 109.2583° W; 25 Jul. 2000; R. Minckley leg.; PCYU • 2 ♀♀; 30 km E of Agua Prieta; 31.3097° N, 109.2542° W; 19 Aug. 2003; A. Nelson leg.; PCYU • 1 ♀; 30 km E of Agua Prieta; 31.3322° N, 109.2703° W; 3 Aug. 2001; R.L. Minckley leg.; RLM • 1 ♀; 30 km E of Agua Prieta; 31.31° N, 109.2778° W; 11 Sep. 2001; R.L. Minckley leg.; RLM • 1 ♀; Rancho Puerta Blanca , Pollination Site 26 , Opuntia, Bulldozer, Rancho Puerta Blanca ; 31.32222° N, 109.07972° W; 24 May 2008; ex Opuntia engelmannii ; RLM • 1 ♀; Rancho San Bernardino ; 31.31° N, 109.2536° W; 25 Aug. 2001; R. Minckley leg.; RLM • 1 ♀; Rancho San Bernardino, 28 km E of Agua Prieta, cienega transect ; [31.31° N, 109.25° W]; 27 Jul. 2000; K. Toal leg.; RLM • 1 ♀; same collection data as for holotype; PCYU • 2 ♀♀; same collection data as for holotype; RLM • 1 ♀; Rancho San Bernardino , Bosque dry , Site 4 ; 31.30972° N, 109.27778° W; 19 Aug. 2003; RLM • 3 ♀♀; Rancho San Bernardino , Bosque wet , Site 1 ; 31.33194° N, 109.27083° W; 10 Aug. 2006; RLM • 1 ♀; Rancho San Bernardino , Bosque wet , Site 6 , Transect 3 ; 31.32957° N, 109.25462° W; 27 Jul. 2007; RLM • 3 ♀♀; Rancho San Bernardino , Bosque wet , Site 7 ; 31.30972° N, 109.25417° W; 19 Aug. 2003; RLM • 2 ♀♀; Rancho San Bernardino , Bosque wet , Site 7 , Transect 2 ; 31.31007° N, 109.25348° W; 26 Jul. 2000; RLM • 1 ♀; same location as for preceding; 12 Aug. 2002; RLM • 1 ♀; Rancho San Bernardino , Cienega house ; 31.33098° N, 109.2676° W; 1 Apr. 2006; RLM • 1 ♀; Rancho San Bernardino , field , Site 3 , Transect 3 ; 31.32222° N, 109.27722° W; 12 Aug. 2002; RLM • 1 ♀; Rancho San Bernardino , grassland , Site 3 ; 31.30222° N, 109.26694° W; 12 Aug. 2006; RLM • 1 ♀; Rancho San Bernardino , Pollination Site 21 , Sphaeralcea, Pond 100 m E of main gate; 31.31583° N, 109.26861° W; 8 Aug. 2006; ex Lycium andersonii ; RLM • 1 ♀; same location as for preceding; 18 Aug. 2006; ex Larrea tridentata ; RLM • 3 ♀♀, 1 ♂; same location as for preceding; 10 Aug. 2007; ex Sphaeralcea laxa ; RLM • 1 ♀; Rancho San Bernardino , Pollination Site 22 , Sphaeralcea , field 3 ; 31.32222° N, 109.27778° W; 6 Aug. 2006; ex Argemone pleiacantha ; RLM • 1 ♀; Rancho San Bernardino , Pollination Site 27 , Horse Corral , 70 m N of main ranch house; 31.32556° N, 109.26667° W; 9 Sep. 2007; ex Sphaeralcea laxa ; RLM • 8 ♀♀; Rancho San Bernardino , quarry, gravel pit ; 31.31964° N, 109.26926° W; 19 Aug. 2003; RLM • 2 ♀♀; Rancho San Bernardino , roadside E of quarry; 31.31996° N, 109.26848° W; 19 Aug. 2003; RLM • 1 ♀; Rancho San Bernardino , roadside W of quarry; 31.31948° N, 109.2701° W; 18 Aug. 2003; RLM • 3 ♀♀; same location as for preceding; 19 Aug. 2003; RLM • 3 ♀♀; Rancho San Bernardino , Riparian , Site 1 , Transect 1 ; 31.33347° N, 109.2601° W; 16 Aug. 2000; RLM • 1 ♀; same location as for preceding; 10 Aug. 2006; RLM • 1 ♀; same location as for preceding; 22 Jul. 2007; RLM • 1 ♀; Rancho San Bernardino , Riparian , Site 2 ; 31.33194° N, 109.25833° W; 20 Aug. 2003; ex Baccharis sarothroides ; RLM • 1 ♀; same location as for preceding; 20 Aug. 2003; RLM • 4 ♀♀; Rancho San Bernardino , Riparian , Site 4 ; 31.32972° N, 109.25583° W; 20 Aug. 2003; RLM.

UNITED STATES – Arizona • 1 ♂; Cochise Co., Benson; [31.97° N, 110.29° W]; 1091 m a.s.l.; 14– 15 Sep. 1974; E.G. and J.M. Linsley leg.; ex Helianthus annuus ; CUIC • 2 ♀♀; Cochise Co., San Bernardino National Wildlife Refuge , Black Draw , Riparian Site 2 ; [31.34° N, 109.26° W]; 16 Aug. 2000; K. Toal leg.; RLM • 1 ♀; Cochise Co., San Bernardino NWR; 31.3344° N, 109.2681° W; 3 Aug. 2001; R.L. Minckley leg.; RLM • 1 ♀; Cochise Co., San Bernardino NWR; [31.34° N, 109.26° W]; 27 Aug. 2001; R. Minckley leg.; RLM • 4 ♀♀; Cochise Co., San Bernardino NWR, Bosque dry , Site 7 ; 31.34118° N, 109.25813° W; 6 Aug. 2003; RLM • 1 ♀; Cochise Co., San Bernardino NWR, Bosque dry , Site 7 , Transect 2 ; 31.34168° N, 109.25825° W; 30 Jul. 2004; RLM • 5 ♀♀; Cochise Co., San Bernardino NWR, Bosque wet , Site 2 ; 31.33633° N, 109.2673° W; 7 Aug. 2003; RLM • 1 ♀; Cochise Co., San Bernardino NWR, Bosque wet , Site 2 , Transect 2 ; 31.33627° N, 109.26752° W; 31 Jul. 2004; RLM • 4 ♀♀; Cochise Co., San Bernardino NWR, Bosque wet , Site 3 ; 31.33517° N, 109.26653° W; 7 Aug. 2003; RLM • 1 ♀; Cochise Co., San Bernardino NWR, Bosque wet , Site 3 , Transect 2 ; 31.33527° N, 109.2668° W; 11 Oct. 2002; RLM • 1 ♀; same location as for preceding; 15 Aug. 2005; RLM • 8 ♀♀; Cochise Co., San Bernardino NWR, Bosque wet , Site 4 ; 31.334° N, 109.2372° W; 5 Aug. 2003; RLM • 1 ♀; Cochise Co., San Bernardino NWR, Bosque wet , Site 4 , Transect 1 ; 31.33693° N, 109.24361° W; 26 Jul. 2007; RLM • 1 ♀; Cochise Co., San Bernardino NWR, field , nr Bathroom , Bee Diversity ; 31.3411° N, 109.27048° W; 15 Oct. 2002; RLM • 1 ♀; Cochise Co., San Bernardino NWR, field , Site 5 , Transect 3 ; 31.33417° N, 109.26778° W; 27 Jul. 2007; RLM • 2 ♀♀; Cochise Co., San Bernardino NWR, field , Site 6 ; 31.33867° N, 109.2719° W; 8 Aug. 2003; RLM • 1 ♀; Cochise Co., San Bernardino NWR, field , Site 6 , Transect 1 ; 31.33417° N, 109.26833° W; 11 Aug. 2005; RLM • 2 ♀♀; Cochise Co., San Bernardino NWR, field , Site 6 , Transect 4; 31.33444° N, 109.26806° W; 3 Jul. 2002; RLM • 2 ♀♀; Cochise Co., San Bernardino NWR, field , Site 8 ; 31.33765° N, 109.26068° W; 6 Aug. 2003; RLM • 1 ♀; same location as for preceding; 6 Apr. 2006; RLM • 1 ♀; Cochise Co., San Bernardino NWR, Grassland , Site 2 , Transect 3 ; 31.3358° N, 109.2702° W; 27 Jul. 2007; RLM • 3 ♀♀; Cochise Co., San Bernardino NWR, Grassland , Site 4 ; 31.33495° N, 109.25314° W; 5 Aug. 2003; RLM • 2 ♀♀; Cochise Co., San Bernardino NWR, Grassland , Site 4 , Transect 1 ; 31.33487° N, 109.2529° W; 26 Jul. 2007; RLM • 2 ♀♀; Cochise Co., San Bernardino NWR, Grassland , Site 5 ; 31.33683° N, 109.25308° W; 5 Aug. 2003; RLM • 2 ♀♀; Cochise Co., San Bernardino NWR, Grassland , Site 5 , Transect 4; 31.3385° N, 109.25308° W; 26 Jul. 2007; RLM • 1 ♀; Cochise Co., San Bernardino NWR, Grassland , Site 8 ; 31.34254° N, 109.27449° W; 12 May 2006; RLM • 2 ♀♀; Cochise Co., San Bernardino NWR, Mesa de la Avanzada , Bee diversity ; 31.34147° N, 109.27278° W; 15 Aug. 2002; RLM • 1 ♀; same location as for preceding; 15 Oct. 2002; RLM • 1 ♂; Pima Co., Greaterville Rd .; 31.7864° N, 110.8231° W; 1320 m a.s.l.; 8 Jul. 2010; Yanega leg.; ex Condalia ; UCRC • 1 ♀; Pinal Co., 8 km SE of San Manuel; 32.5974° N, 110.5388° W; 15 Apr. 2014; R.G. Laport leg.; ex Larrea tridentata ; RLM • 1 ♀; Yavapai Co., Montezuma Castle ; [34.61° N, 111.84° W]; 25 Jun. 1973; H. Nagase leg.; LACM • 1 ♀; 30 km E of Douglas; 31.3383° N, 109.2683° W; 3 Sep. 2000; R. Minckley leg.; ex Baccharis sarothroides ; RLM • 1 ♂; 6 mi. SE of Patagonia; [31.48° N, 110.83° W]; 26 Jul. 1962; Werner, Bequaert and Noller leg.; ex Condalia lycioides and Baccharis salicina ; CUIC • 1 ♂; Arivaca ; [31.58° N, 111.33° W]; 12 Jul. 1940; R.H. Beamer leg.; SEMC • 1 ♂; Tucson ; [32.22° N, 110.97° W]; 14 Jul. 1950; J.G. Rozen leg.; SEMC. – New Mexico • 1 ♂; Luna Co., 32 km E of Deming; [32.27° N, 107.42° W]; 1300 m a.s.l.; 7 Aug. 1998; R. Minckley and K. Toal leg.; RLM.

Description

Female

COLOURATION. Head and mesosoma blue-green to golden-green; clypeus apical colour black, reddish brown, or orange; labrum reddish brown to orange; mandible orange with black basal spot or band and red tip; flagellum reddish brown dorsally, brown to orange ventrally; pronotal lobe reddish brown to orange; metasoma red to orange with dark spiracular spots on T2–4; legs reddish brown with femur-tibia joints, base and apex of tibiae, and tarsi orange; tegula orange; wing membrane hyaline, veins brown to dark brown.

PUBESCENCE. Body hair colour white. Tomentum dense on paraocular area, gena, pronotal collar and lobe, and space between pronotal lobe and tegula; sparse on face below eye emargination, episterna, very narrow basal bands on T2–3, and basal half of T4. Scutum hair thin. Wing hairs dark or light, short and dense. Acarinarial fan complete, sparse. T2 fringes sparse, T3 fringes sparse.

SURFACE SCULPTURE. Clypeus punctures large and irregularly sparse (i <2 pd), becoming fine and moderately dense in basal third (i=1–2 pd), sculpture shiny, becoming weakly tessellate basally; supraclypeal area punctures sparse (i=1–3 pd), sculpture weakly tessellate, sometimes shiny medially; paraocular area punctures crowded (i=0 pd), slightly sparser around antenna socket (i ≤ 1 pd), sculpture weakly tessellate around antenna socket, otherwise shiny; frons punctures crowded (i =0 pd), sculpture shiny or imbricate; vertex punctures dense laterally (i ≤ 1 pd), sparse medially (i= 1–3 pd), sometimes obscure, sculpture shiny, sometimes imbricate laterally; gena punctures fine, moderately sparse (i=1–3 pd), sculpture shiny; postgena sculpture shiny, becoming tessellate posteriorly; tegula punctures absent; scutum punctures dense (i <1 pd), becoming moderately sparse submedially and anteromedially (i=1–2 pd), sculpture shiny to weakly tessellate, becoming more strongly tessellate anteromedially; scutellum punctures dense marginally and on median line (i <1 pd), sparse submedially (i =1–4 pd), diversopunctate, sculpture shiny to tessellate; metanotum sculpture tessellate or imbricate, sometimes becoming shiny and finely, densely punctate medially (i <1 pd); metapostnotum rugae strong, anastomosing, not reaching margin, sculpture tessellate; preëpisternum sculpture areolaterugulose; hypoepimeron punctures crowded (i=0 pd), sculpture shiny to weakly imbricate, sometimes weakly ruguloso-punctate; mesepisternum punctures crowded (i=0 pd), sculpture weakly imbricate and ruguloso-punctate; metepisternum sculpture ruguloso-lineate dorsally, imbricate ventrally; propodeum lateral face sculpture tessellate; propodeum posterior face sculpture tessellate; T1 anterior face sculpture coriarious; T1 dorsal surface punctures fine, sparse (i = 2–5 pd), absent or very sparse in large apicolateral patches, sculpture shiny, becoming weakly coriarious on rim; T2 disc punctures fine, moderately sparse (i =1–4 pd), disc sculpture shiny to weakly coriarious, rim punctures fine, sparse (i =1–4 pd), obscure, rim sculpture coriarious.

STRUCTURE. Face length/width ratio 0.8 (± 0.02 SD). Clypeus projecting ~50% below suborbital tangent; clypeal area length/width ratio 0.43 (± 0.02 SD); apicolateral denticles rounded acute points; supraclypeal area length/width ratio 0.74 (± 0.09 SD). Forewing with 3 submarginal cells; pronotal angle obtuse; tegula shape normal. Intertegular distance 0.95 (± 0.05 SD) mm. Scutum length/width ratio 0.77 (± 0.05 SD); scutum/scutellum length ratio 2.87 (± 0.2 SD); scutellum/metanotum length ratio 1.61 (± 0.22 SD); metanotum/metapostnotum length ratio 0.69 (± 0.08 SD). Propodeum lateral carinae not reaching dorsal margin; oblique carina very weak or absent. T2 depressed apical rim length about 50% of segment. (n= 10)

Male

COLOURATION. Head and mesosoma blue to olive green; clypeus apical colour reddish brown to orange; labrum orange; mandible orange with black basal spot and red tip; flagellum reddish brown dorsally, orange to brown ventrally; pronotal lobe orange; metasoma orange to reddish brown with dark spiracular spots on T2–4; legs orange with coxae, trochanters, femora, and tibiae sometimes reddish brown; tegula orange; wing membrane hyaline, veins brown to dark brown.

PUBESCENCE. Body hair colour white. Tomentum dense on face below eye emargination, gena, pronotal angle and lobe, and space between pronotal lobe and tegula; sparse on episterna. Scutum hair thin to moderately plumose. Sterna hair short (0.5–1.5 OD), moderately plumose, dense and erect. Wing hairs dark or light, short and sparse.

SURFACE SCULPTURE. Clypeus punctures moderately dense (i=1–2 pd), sculpture shiny; supraclypeal area punctures moderately dense (i =1–2 pd), sculpture shiny; paraocular area punctures dense (i <1 pd), sculpture shiny; frons punctures dense (i <1 pd), becoming crowded above antenna (i=0 pd), sculpture shiny, becoming rugulose above antenna; vertex punctures dense laterally (i ≤ 1 pd), sparse medially (i =1–4 pd), sculpture shiny; gena punctures sparse (i =1–3 pd), sculpture shiny; postgena sculpture imbricate; tegula punctures absent; scutum punctures moderately sparse (i= 1–2 pd), becoming sparse submedially (i=1–3 pd), sculpture shiny, sometimes becoming tessellate anteromedially; scutellum punctures dense to moderately sparse marginally and on median line (i ≤ 2 pd), sparse submedially (i =1–4 pd), sculpture shiny; metanotum sculpture shiny and densely punctate (i ≤ 1 pd); metapostnotum rugae strong, anastomosing, not reaching margin, sculpture shiny to tessellate; preëpisternum sculpture areolate-rugulose; hypoepimeron punctures crowded (i= 0 pd), sculpture shiny to imbricate; mesepisternum punctures dense (i <1 pd), sculpture shiny to imbricate; metepisternum sculpture ruguloso-lineate dorsally, areolate ventrally; propodeum lateral face punctures obscure, sculpture imbricate to rugulose; propodeum posterior face sculpture shiny; T1 anterior face sculpture shiny; T1 dorsal surface punctures moderately dense (i=1–3 pd), sculpture shiny; T2 disc punctures moderately dense (i=1–2 pd), disc sculpture shiny, rim punctures sparse medially (i=1–4 pd), absent laterally, rim sculpture shiny.

STRUCTURE. Face length/width ratio 0.83 (± 0.01 SD). F1:pedicel length ratio 0.87 (± 0.06 SD); F2:F1 length ratio 1.58 (± 0.11 SD); F2 length/width ratio 1.25 (± 0.09 SD); F9 length/width ratio 1.18 (± 0.12 SD). Forewing with 3 submarginal cells; pronotal angle obtuse; tegula shape normal. Intertegular distance 0.87 (± 0.05 SD) mm. Scutum length/width ratio 0.76 (± 0.02 SD); scutum/scutellum length ratio 3.16 (± 0.32 SD); scutellum/metanotum length ratio 1.33 (± 0.15 SD); metanotum/metapostnotum length ratio 0.71 (± 0.08 SD). Propodeum lateral carinae not reaching dorsal margin; oblique carina absent. (n =7)

GENITALIA. As in Fig. 90J . Gonocoxite relatively narrow, rounded. Gonostylus with very few long hairs. Retrorse lobe very broad, ovoid, with very sparse short hairs.

Range

Southern Arizona and New Mexico and northern Sonora ( Fig. 66 ).

Floral records

ASTERACEAE Giseke : Baccharis : B. sarothroides A.Gray • Helianthus : H. annuus L. • CACTACEAE Juss. Opuntia Mill. O. engelmannii Salm-Dyck ex Engelm. • MALVACEAE Juss. Sphaeralcea A. St. -Hil. S. laxa Wooton & Standl. • PAPAVERACEAE Juss. Argemone L. A. pleiacantha Greene • RHAMNACEAE Juss. Condalia Cav. • SOLANACEAE Adans. Lycium L. L. andersonii A.Gray • ZYGOPHYLLACEAE R.Br. Larrea Cav. L. tridentata (Sessé & Moc. ex DC.) Coville.

DNA barcodes

Three sequences available (BOLD process IDs: DLII775-07, DLII1555-09, DLII1572-09; BIN: BOLD:AAJ1796). Lasioglossum minckleyi sp. nov. differs from all other western red-tailed L. ( Dialictus ) by 2 fixed substitutions: 348(C) and 510(G) (Supplementary file 4).

Remarks

The vast majority of known specimens are from Minckley’s collections in the San Bernardino National Wildlife Refuge and Rancho San Bernardino (summarized in Minckley 2008). Lasioglossum minckleyi sp. nov. seems to be uncommon outside of this area.

Figures

Fig. 3. Clypeus apicolateral denticles. A. Lasioglossum (D.) minckleyi sp. nov., acute points. B. L. (D.) arenisaltans sp. nov., low knobs.

Fig. 64. Lasioglossum (D.) minckleyi sp. nov., ♀. A. Lateral habitus. B. Dorsal habitus. C. Face. D. Propodeum. E. Metasoma. Scale bars: 1 mm.

Fig. 65. Lasioglossum (D.) minckleyi sp. nov., ♂. A. Dorsal habitus. B. Lateral habitus. C. Face. D. Propodeum and metasoma. Scale bars: 1 mm.

Fig. 66. Georeferenced collection records of Lasioglossum (D.) minckleyi sp. nov. (black squares) and predicted distribution by maximum entropy ecological niche modeling in Maxent (colour shading). Warmer colours indicate higher cloglog probability of occurrence.

Fig. 90. Male genitalia. A. Lasioglossum (D.) arenisaltans sp. nov. B. L. (D.) clastipedion sp. nov. C. L. (D.) clematisellum (Cockerell, 1904). D. L. (D.) hudsoniellum (Cockerell, 1919). E. L. (D.) julipile sp. nov. F. L. (D.) lilianae sp. nov. G. L. (D.) mesillense (Cockerell, 1898). H. L. (D.) meteorum sp. nov. I. L. (D.) miltolepoides sp. nov. J. L. (D.) minckleyi sp. nov. K. L. (D.) pallidellum (Ellis, 1914). L. L. (D.) pictum (Crawford, 1902). M. L. (D.) rufornatum sp. nov. N. L. (D.) spivakae sp. nov. O. L. (D.) testaceum (Robertson, 1897).P. L. (D.) vierecki (Crawford, 1904). Q. L. (D.) zephyrus (Smith, 1853). Genitalia are illustrated in dorsal view and positioned such that the gonostylus is parallel to the plane of vision. Retrorse lobes are also illustrated separately to the bottom left of each figure in lateral view, positioned parallel to the plane of vision.

Fig. 98. Propodeum. A. Lasioglossum (D.) testaceum (Robertson, 1897), ♀, with strong oblique carina (arrow). B. L. (D.) minckleyi sp. nov., ♀, without oblique carina. Scale bars: 0.5 mm.

Fig. 107. Pronotal angle (arrow and outline). A. Lasioglossum (D.) hudsoniellum (Cockerell, 1919), ♀, nearly 90 degrees. B. L. (D.) minckleyi sp. nov., ♀, obtuse. Scale bars: 0.5 mm.