Onychotillus vittatus Chapin, 1945

Burke, Alan & Zolnerowich, Gregory, 2017, A taxonomic revision of the subfamily Tillinae Leach sensu lato (Coleoptera, Cleridae) in the New World, ZooKeys 719, pp. 75-157 : 142-149

Onychotillus vittatus Chapin, 1945 Figs 5B, 10F, 17I

Type material not examined.

Type locality.

Great Goat, Jamaica. Type depository: National Museum of Natural History (NMNH).

Distribution.

Dominican Republic*, Jamaica.

Differential diagnosis.

Onychotillus vittatus is most similar to O. cubana . Characters to distinguish these species are given in the diagnosis of O. cubana .

Description.

Male. Form: Slender, moderately small, elongate individuals. Color: Head, pronotum, antennae, mouthparts, elytra, meso and metathorax metallic blue to almost piceous; legs with femora bicolored, anterior portion light testaceous to pale yellow, posterior portion metallic blue to almost black; tibiae uniformly metallic blue to almost black; abdomen uniformly piceous to black; elytral disc without fasciae or maculae (Fig. 5B).

Head: Measured across eyes narrower than pronotum; surface rugose, somewhat punctate; punctures broad and shallow; clothed with long, recumbent setae and some semirecumbent setae; frons bi-impressed; eyes large, rounded, slightly taller than wide, bulging laterally, finely faceted. Antennae extending slightly beyond anterior margin of elytra; second antennomere short, robust; third antennomere slightly longer than second antennomere; antennomeres 4-5 each about the same length as third antennomere; sixth antennomere slightly shorter than fifth antennomere; antennomeres 6-10 subequal in length; antennomere 2-5 subcylindrical; antenno meres 6-10 feebly serrate; eleventh antennomere cylindrical, acuminate posteriorly, slightly compressed medially, approximately 2 × longer than the length of tenth antennomere (Fig. 10F).

Thorax: Pronotum short, as wide as long to slightly longer than wide; sides weakly constricted anteriorly and subapically; conspicuously widest in front of middle; disc convex; anterior transverse depression and subbasal tumescence absent; surface clothed with short, recumbent setae intermixed with some long, semierect setae; integument rugulose; conspicuously punctate, punctations somewhat small and shallow. Prosternum shiny, with a longitudinal carina that divides this plate; moderately excavated laterally; feebly punctate. Mesoventrite coarsely punctate; punctations wide and deep; glabrous to slightly clothed with long, semirecumbent setae. Metaventrite conspicuously wider than long; strongly concave; surface rugose; moderately, shallowly punctate; vested with fine, pale, recumbent setae.

Legs: Femora feebly rugose, shiny; clothed with fine, pale recumbent and semirecumbent setae. Tibiae transversally rugose; more conspicuously vested than femora; fourth tarsomeres with pulvilli not incised medially.

Elytra: Anterior base wider than pronotum; humeri indicated; sides subparallel; widest at middle; disc moderately convex; surface rugulose; apices rounded, slightly dehiscent; clothed with short, semirecumbent setae intermingled with some long, erect setae; sculpturing consists of coarse punctations arranged in regular striae that gradually become smaller toward apex, striae reaching elytral apex; interstices at elytral base about 2.5 × the width of punctuation.

Abdomen: Six visible ventrites. First visible ventrite feebly elevated medially; anterolateral region very feeble excavated; ventrites 1-5 moderately rugose; subquadrate; shallowly punctate; vested with long, fine, pale, recumbent setae. Fifth visible ventrite with lateral margins subparallel and posterior margin truncate. Sixth visible ventrite small, subquadrate, broader than long; surface rugose; somewhat punctate; lateral margins conspicuously oblique; posterior margin broadly rounded (Fig. 17I). Fifth tergite broadly convex, rugulose; lateral margins subparallel; posterior margin truncate. Sixth tergite subquadrate, as broader as long; surface rugulose; lateral margins slightly oblique; posterior margin triangular, acuminate distally (Fig. 17I). Sixth tergite extending beyond posterior margin of sixth visible ventrite; fully covering the sixth visible ventrite from dorsal view.

Aedeagus: Not available.

Sexual dimorphism: Females of Onychotillus vittatus differ from males by having the eleventh antennomere approximately 2 × longer than the tenth antennomere, rather than 3 -3.5 × longer, as in males. In addition, females have the lateral and posterior margins of the sixth visible ventrite broadly rounded, giving the appearance of a semicircular margin, rather than subtriangular in shape and posteriorly acuminate, as seen in males (Fig. 17I).

Material examined.

1 male, 2 females: Dominican Republic, Provincia La Vega, La Cienega de Manabao Park Headquarter, 3-5-VII-1999, 3000', R. E. Woodruff, backlight; 1 female: Constanza, Santo Domingo, 5000', IX-1922, [no collector data]; 2 females: Jamaica, Bull Run, St. Andrew Park, 19-IV-1959, Farr and Sanderson.