Omolabus laesicollis (Gyllenhal)

HAMILTON, ROBERT W., 2005, Omolabus Jekel in north and central America (Coleoptera: Attelabidae), Zootaxa 986 (1), pp. 1-60 : 14-17

Omolabus laesicollis (Gyllenhal)

( Figs. 4 , 11 , 33, 34, 35 & 36)

Attelabus laesicollis Gyllenhal 1839: 305

Omolabus biimpressus Voss 1943: 29

Xestolabus laesicollis (Gyllenhal) ; O’Brien & Wibmer 1982: 13 Attelabus brevicollis Sharp 1889: 9

Type Locality. Mexico.

Type data. Type not examined.

Type Holder. Swedish Museum of Natural History ( SMNH).

Size Range. Male: 2.9 x 1.6 mm (minor male) to 5.4 x 2.7 mm (major male); Female: 2.8 x 1.6 mm (minor female) to 5.5 x 2.7 mm (major female).

Description. Body black with lateral margins of first and second abdominal sternites reddish. (Major Male): Head elongate, with pair of raised areas at dorsal base separated by line­like sulcus, with coarse punctures dorsally near eyes, with distinct subocular denticulate projection; with oval strigate genal concavity; frons with wide rugosely punctured channel; vertex with wide rugosely punctured concavity, with coarse punctures dorsally behind eyes; eyes rounded, strongly protuberant. Rostrum distinctly longer than head, dorsally bisulcate from base to antennal insertions, distinctly punctured before antennal insertions, less punctured beyond, width at apex slightly more than twice as wide as frons, with irregularly margined midventral ridge extending from level of antennal insertions to postlabial area; ridge more prominent in apical 1/4; postlabial area with pair of forward projecting processes; processes parallel­sided, flattened, slightly divergent and apically truncated. Antennae inserted near basal 1/3, club elongate­compact, distinctly shorter than funicle; basal club segment longest; middle segment shorter than basal segment; terminal segment shorter than middle segment; funicular segment 1 subequal to scape; segment 2–4 clavate, subequal in length to 1; 5–7 moniliform, subequal. Pronotum robust, ventrally strigate, with single midventral blunt “chest” denticle between coxae and antero­ventral pronotal edge, with small rounded postocular lobes, with scattered small shallow punctures above and larger more numerous lateral punctures, in dorsal view sides broadly rounded, arched out; anterior collar distinct, band­like; disk with pair of longitudinally oval depressions and pair of widely set foveae. Scutellum wide, twice as wide as long, 5­ sided, posterior margin weakly angled at middle, with very small punctures. Elytra only slightly longer than wide, in dorsal view slightly narrowed from base to apices, widest at humeri, with weak transverse depression behind scutellum; humeri simple, rounded, distinctly protuberant; striae distinct throughout, larger and more deeply impressed at base, becoming progressively smaller beyond base; intervals flat, smooth, wide. (Minor male): Head not elongate, without dorso­basal raised areas, with weakly developed subocular denticle and strigate genal concavity, frons densely punctured and strigately channeled, vertex with shallow strigate concavity; antennae inserted near basal ¼; eyes oval; rostrum subequal to head in length, midventral ridge not developed throughout, postlabial area only with pair of small bump­like projections; pronotum not robust, with small single midventral “chest” denticle, without longitudinally oval depressions on disk, foveae only weakly impressed, postocular lobes indistinct. (Female): Head not elongate, without dorso­basal raised areas, denticles or genal concavities; rostrum subequal to head in length, without postlabial armature; antennae inserted near basal ¼ of rostrum; pronotum not robust, without “chest” denticle or postocular lobes, only with pair of shallow foveae on disk.

Distribution ( Fig. 4 ). Omolabus laesicollis ranges widely through Central America. Specimens have been examined from Mexico, El Salvador, Guatemala, Honduras, Nicaragua and Costa Rica.

Comments. This species is easily confused with O. corvinus when only females are examined. Major males of O. laesicollis can be easily identified by their irregular midventral rostral ridge (Fig. 33) and the unique postlabial projections. Major and minor males and females of O. laesicollis have confused the taxonomy. The minors are distinctly smaller in size. Sexually dimorphic head and rostral characters present in the major males are poorly developed or indistinct in the minor males.

Host plants. Omolabus laesicollis is associated with various Anacardiaceae throughout its range. It is recorded from Spondias purpurea L. and Spondias mombin L. in Costa Rica. This species and O. corvinus have been found rolling the leaves of the same Spondias tree ( Vogt, 1992). Vogt also recorded it from S. purpurea , Rhus sp. and Rhus copallina L. in Mexico.

Specimen data. 410 specimens were examined. The sexes and label data are as follows:

COSTA RICA: 16 males & 13 females, Guan. [Guanacaste], 13 mi SE Liberia, 12­ vii­1974, 400' on Spondias purpurea , CW & L O’Brien & Marshall; 1 male, Guanac. [Guanacaste], 4 mi NW Cahas, 7–9 vii­1966, JB Karren; 1 female, Guana. [Guanacaste], P. N. Santa Rosa Cafetal, 19­vii­1991, RW Flowers; 1 female, Gua. [Guanacaste], 14 km S Canas, 10–15 x­1990, FD Parker; 1 female [same except 20–30 x­1989] (CWOB); 2 males & 2 females, Guanacaste prov., 6 mi S, 6 mi W Canas, Taboga, 7­vii­1968, 10° 19' N 85° 09' W, H Hespenheide (CHAH); 1 male [same except 6­vii­1968]; 2 males & 2 females, San Lucas, 7­vii­1934, on Spondias mombin , CH Ballou; 1 male & 1 female, San Jose, 9­ x­1932, CH Ballou; 1 male, Guanacaste prov., Santa Rosa N. P., 23­vii to 2­viii­1980, D Whitehead; 1 female, Guan., 3 mi NW Canas La Pacifica, 12­vii­1974, O’Brien & Marshall; 1 male & 1 female, on route to Palo Verde, viii­1984, Spondias, G Vogt (USNM).

EL SALVADOR: 1 female, Santa Tecia, 20­v­1954, PA Berry; 3 males & 8 females, (Pto). Barrios), km 40–50 La Libertad, 1979, Spondias, G Vogt (USNM); 1 female, (same except no date); 1 male & 1 female, Monte Cristo, 23 km N Metapan, 8–10 v­1971, 2,300 m, HF Howden (HAHC); 1 male & 1 female, 15­ix­1982 (TAMC).

GUATEMALA: 1 female, Frontier­Ahuachan, El Salvador, 25­viii­1985, E Barrera (CWOB); 1 female, Puente Sulfate, 1980, San Pedro Sumac, G Vogt; 1 female, Barrios km10, viii­1979, Spondias, G Vogt ; 16 males & 10 females, Escuintla, km 45, ab.[above] Escuintla below Armatitlan, 1979, Spondias, G Vogt ; 3 males & 4 females, Puente Arqueta, km 161 Pto. Barrios, 1979, Spondias, G Vogt ; 2 males & 6 females, Quezaltenango, El Reposo, viii­1980, Spondias, G Vogt ; 1 female, Quezaltenango km 30 El Reposo along Rio Grijalval, 1­viii­1981, Guttifera, grows along hedge rows, G Vogt; 14 males & 19 females, Puente Sulfate [?], 1980, Spondias, G Vogt ; 2 males & 5 females, Puente Sulfate, Cirquelillo [?], [1­ix­1980], G Vogt (USNM).

HONDURAS: 1 male & 1 female, Com. [Comayagua], 5 km NW Taulabe Rio Taltique, 29­vii­1977, O’Brien & Marshall; 1 male, Dept. El Praiso Montserrat, 25­v­1993, 5,500', MC Thomas (CWOB); 2 females, [Cortes], ix­1979, San Pedro, sumac, G Vogt; 1 male, Taladro, 23­viii­1980, J V Mankins; 1 female (same except 12­x­1979); 1 male, Danli, 24­viii­1979, JV Mankins; 1 male, La Paz, 14­vi­1981, JV Mankins; 2, 5 mi W Neuva Ocotep. [Ocotepeque], 1979, Spondias, G Vogt ; 4 males & 5 females, 2 mi NW Ocote.[Nueva Ocotepeque], 29­viii­1989, Spondias, G Vogt ; 9 males & 15 females, [Copan], 10 mi S of Copan, 1980, Spondias, G Vogt (USNM); 1 male, Franc. Mar. [Francisco Morazan], Zamorano, 12­vi­ 1994, 820 m, mixed shrub edge, R Anderson (CMNC).

MEXICO: 1 female, Tamaulipas, Bocotoma area, 7 km SSE, Gomez Farias, 1/ 4­vi­ 1982, JE Wappes; 1 female, Nayarit, 44 mi NW Tepic, 30­viii­1971, WJ Hanson; 1 female, Jal. [Jalisco], 1 km E El Cumbre, Tomatlan Rd., 26­vii­1993, Tropical deciduous forest, CL Bellamy (CWOB); 1 male, Guerrero, Hwy 95, 9– 12 km N El Ocotito, 6/ 7­vii­1990, 2,900'–3200' dec. for./oak trans., J Rifkind & P. Gum; 1 female, Guerrero, Hwy 95 nr. Pozo Del Obispo, 7­vii­1990, pine/oak 3,400', J Rifkind & P. Gum (SEMC); 1 male & 2 female, Nay.[Nayarit], nr. Jesus Maria Arroyo Santiago, 5­vii­1955, B. Malkin; 1 female, Sinaloa, Los Mayos, 24­vii­1952, JD Lattig (UCBC); 1 female, [ Mex.?], Loc. Rosario Cuzcatlan, 4­vii­1953, Salazar; 1 female, [ Mex?], Los Chorias [?], 29­vii­1952, Salazar; 4 females, Veracruz, Rte.143, 18.8 km NE Hautusco, El Mirador, 22­xii­1978, ravine, coffee finca, in bromeliads, GE & KE Ball; 2 females, Tejupilco­Temescaltepec [between], vii­1932, HE Hinton & RL Usinger; 1 female, Tejupilco­Temescaltepec, 18­vi­1933, E. C. Zimmerman; 1 female, S. L. P.[San Luis Potosi], Huichuican, 3­iii­1952, orchid plants, [at Laredo TX]; 2 males, [ Mexico?], Los Rosarios Cuzcatlan [?], 17­vii­1955, MSV; 2 males & 4 females, 21­vii­1955, MSV (USNM); 3 males & 5 females, Guerrero, 7.2 km NW El Ocotito, 7­vii­ 1987, 853 km, oak­pine­acacia woodland, R Anderson (CMNC); 1 male, Guerrero, Acapulco, 20­viii­1988 [?], LJ Lipovsky (SEMC); 1 female, Tejupilco­Temescaltepec, 27­vi­ 1935, HE Hinton & RL Usinger (CASC); 9 males & 13 females, Tamaulipas, 2 miles SE Gomez Farias, 20­vii­1970, Murray, Phelps, Hart, Schaffner; 1 female, Guerrero, 32 mi SE Petatlan, 14­vii­1984, J B Wooley; 2 females, Guerrero, 10.3 mi S Iguala, 23­vii­1981, Bogar, Schaffner & Friedlander; 1 male, Tamaulipas, 2 mi SE Gomez Farias, 20­vii­1970, Murray, Phelps & Hart (TAMC); 1 male, Tejupilco­Temescaltepec, vii­1992 (CASC); 11 males & 13 females, [ Mexico], 1986, G Vogt; 2 males & 1 female, Sinaloa, Leptura, N Mazatlan, 1986, G Vogt; 5 males & 4 females, [ Mexico], [no other data], G Vogt; 1 male, [Guerrero], km 60 above Iguala, Spondias, G Vogt ; 16 males & 14 females, [ Mexico], 1986, G Vogt; 11 males & 8 females, [ Mexico], 1986, G Vogt; 5 males & 5 females, [ Mexico], 1986, G Vogt; 7 males & 4 females, [ Mexico], 1986, G Vogt; 1 male & 1 female, [Chiapas], 38 mi E Escuintla­Cirguelillo, vii­1980, G Vogt; 1 female, 1978, G. Vogt; 5 males & 4 females, [Guerrero], Rio Papagayo, km 70, S. purpurea , viii­1987, G Vogt; 4 males & 9 females, [Puebla], km 45 Arroya Sta Theresa, ix­1981, Rhus copalina, G Vogt ; 6 males, [Guerrero], km 70–74 Chilpancingo­Acapuclo, Spondias, G Vogt ; 1 male & 13 females, [Guerrero], Spondias, G Vogt ; 1 female, [Nayarit?], Km 60, Tepic­Pto.Vallarta, ix­1981, gutifera [Guttiferae?], G Vogt (USNM).

NICARAGUA: 1 female, Granada, V. Mombaco [?], 9­vii­1994, Maes, Tellez & Hernandez (CWOB).

Figures

FIGURES 1 – 8. Distribution of Omolabus species: 1) Omolabus veracruensis (square), Omolabus spinipectus (circle), Omolabus megalomus (triangle), Omolabus fasciventris (open triangle) 2) Omolabus ligulatus (circle), Omolabus quadratus (open triangle) 3) Omolabus heterocerus (triangle), Omolabus angulipennis (circle) 4) Omolabus laesicollis 5) Omolabus corvinus 6) Omolabus sedatus (circle), Omolabus longiclava (triangle) 7) Omolabus callosus 8) Omolabus conicollis.

FIGURES 9 – 14. Male genitalia of Omolabus species, 64 X: a) tegmen, dorsal view b) median lobe with endophallic sac and transfer apparatus in repose, ventral view 9) Omolabus spinipectus, Costa Rica, Puntarenas 10) Omolabus quadratus, Panama, Pina 11) Omolabus laesicollis Mexico, Guerrero 12) Omolabus angulipennis, Costa Rica, Puntarenas 13) Omolabus corvinus, Mexico, Quintana Roo 14) Omolabus ligulatus, Honduras, Tela.