Omolabus angulipennis (Sharp)

HAMILTON, ROBERT W., 2005, Omolabus Jekel in north and central America (Coleoptera: Attelabidae), Zootaxa 986 (1), pp. 1-60 : 17-19

Omolabus angulipennis (Sharp)

( Figs. 3 , 12 , 37, 38, 39 & 40)

Attelabus angulipennis Sharp 1889: 8 Type locality. Guatemala

Type data. Female holotype (mounted on long paper point) with the following labels: Type (circular label with red margin); Guatemala Champion; BCA Col. iv.3, Attelabus angulipennis Sharp ; Attelabus angulipennis , type D. S., Guatemala Champion.

Type holder. British Museum of Natural History ( BMNH)

Size range. Male: 3.5 x 1.7 mm to 5.0 x 2.7 mm; Female 3.5 x 1.8 mm to 4.5 x 2.4 mm.

Description. Body color variable from light reddish­brown to dark reddish­brown or greenish­brown. Head with very small shallow widely spaced punctures; vertex weakly convex; frons bisulcate with some irregularly spaced punctures; eyes reniform, moderately protuberant. Rostrum in male subequal in length to head, shorter than head in female, moderately punctured throughout, widened at apex to width more than twice as wide as frons; postlabial area with pair of acute downward projecting denticles in male. Antennae inserted near basal 1/3 of rostrum in male, closer to base in female; club elongate­compact, distinctly shorter than funicle; basal and terminal club segments nearly subequal in length; middle segment slightly shorter; funicular segment 1 ovo­globose, shorter than scape; 2­4 subequal, clavate; 5–7 subequal, short clavate, apically robust. Pronotum smooth, shiny, with numerous minute widely spaced punctures; anterior collar weakly defined, dorsally widened and v­shaped. Scutellum slightly wider than long, 4­sided, posterior margin broadly rounded, with minute shallow punctures. Elytra slightly wider than long, widest at humeri, in dorsal view narrowed posteriorly, not transversely depressed behind scutellum; humeri obliquely angled, with small acute postero­lateral projecting denticle; striae small, round, more deeply impressed at elytral base, becoming smaller posteriorly; intervals weakly convex at elytral base, becoming flat and wider posteriorly. Profemora evenly swollen in both sexes.

Distribution ( Fig. 3 ). This is a widespread Central American species that is recorded from southeastern Mexico, Guatemala, El Salvador, Costa Rica and Panama.

Comments. This species has three color forms: dark reddish­brown, pale reddishbrown and greenish­brown. It can be identified by the small acute humeral denticle and the smooth unsculptured pronotum (Figs. 38 & 40).

Host plants. Vogt (1992) recorded this species as nidifying the same anacard hosts as O. ligulatus (i.e., Astronium graveolens Jacq. , S. mombin & S. purpurea ).

Specimen data. 94 specimens were examined. The sexes and label data are as follows:

COSTA RICA: 1 male & 3 females, Punt.[Puntarenas], Monteverde, Hotel Belmar, 28­v, 1­v­1994, Cloud Forest, ca. 4,500', J Rifkind & P Gum; 1 male, Punt., Monteverde, 20–24 vi­1986, W Hanson & G Bohart; 3 females, Puntarenas, Monteverde, 26­v, 3­v­ 1984, E Riley & D Rider & D La Doux; 1 female, Guan.[Guanacaste], Est. [Estacion] Cacao, SW side Volcan Cacao, 4­v­1995, 1000 m, ML Jamerson (CWOB); 13 males & 21 females, Punt., 1400 m, Monteverde, 25­v­1979, H & A Howden; 1 male & 1 female, Puntarenas Prov.[Province], 1400 m, Monteverde, 23–28 ii­1980, RS Anderson; 1 female (same except 12–14 vii­1987) H & A Howden; 1 female, Punt., 1400 m, Hoag farm, Monteverde, 3­vi­1979, H & A Howden; 1 female, Punt., 1500 m, Monteverde, 24­ii­1991, H & A Howden; 1 male & 1 female (same except 28­v­1979); 1 male, Puntarenas, Monteverde, 1400 m, 21–24 viii­1987, H & A Howden; 1 male & 1 female (same except 22­v­ 1979); 1 male & 1 female (same except 26­v­1979); 1 male & 1 female, Guanac.[Guanacaste], Guanacaste Conservation Area, Cacao Field Station, 4­v­1995, 1000 m, mont.[montane], hardwood­cloud forest, R Anderson (CMNC); 1 female, Prov. Guanacaste, Est. Cacao, Lado SO Vol. Cacao, P. N. Guan., 21–29 v­1992, 1000–1,400 m, D Brenes; 1 male, Guanac. Pr. [Guanacaste province] Estac. Cacao, SW side Volcan Cacao, iv­1988, 1000–1,400 m, M Espinoza (INBC).

EL SALVADOR: 1 male, Santa Clara, 1800 m, Boqueron, 2­v­1971, H & A Howden (CMNC).

GUATEMALA: 1 male, 14.5 km SE Guatemala Puenta Parada 1790 m, 13­vi­1991, H Howden (CMNC); 1 female, S. P. [?] Yepocapa, Chimal.[Chimaltenango], elevation 4800 ft, 29­iv­1948, CNMH Guatemala Zool. Exped. (1948), RD Mitchell; 1 female (same except 24­iv­1948); 1 female (same except 27­iv­1948, sweeping vegetation, RL Wenzel) (FMNH).

MEXICO: 1 male, Chiapas, 7.4 km N Bochil, 13­ix­1981, Clark & Coe (CWOB); 1 male, Veracruz, Catemaco, Coyame Lake, 1–15 vii­1963, DR Whitehead; 5 males & 1 female, Chiapas, hwy 24, 9 mi SE Teopisca, 16­v­1969, HF Howden (CMNC); 13 males & 5 females, Guerrero, just below San Vincent de Benitez, 30­viii­1982, 8.3 mi above Atoyac, nidifying oak [?], G Vogt; 1 male, G Vogt (USNM).

PANAMA: 1 male, 7 mi SW El Valle, 6­vii­1974, 2,300', night, CW & L O’Brien & Marshall (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.