Cylidrus Latreille, 1829

Burke, Alan & Zolnerowich, Gregory, 2017, A taxonomic revision of the subfamily Tillinae Leach sensu lato (Coleoptera, Cleridae) in the New World, ZooKeys 179, pp. 75-157 : 98-99

Cylidrus Latreille, 1829

Type species.

Clerus cyaneus Fabricius, 1787, original designation.

Synonyms.

Epiteles Newman, 1842. List of insects collected at Port Philipp, South Australia, by Edmund Thomas Higgins. Esq. (continued): Entomologist, vol. 1, pp. 361-369; 401-405 (1842).

Differential diagnosis.

Member of Cylidrus can be separated from remaining New World Tillinae species by the structure of the head (Figs 3A, 5D) and antennae (Fig. 8G). No other tilline in the New World has the head subquadrate in shape and conspicuously enlarged, the frons as wide as the total pronotal width, and the antennomeres 5-11 or 6-11 expanded and compressed laterally (Fig. 8G).

Redescription.

Size: 5-15 mm. Color: Light testaceous to black, fasciae on elytral disc absent or present, if present of various sizes and shapes. Body: Subparallel, elongate, robust to slender.

Head: Large, subquadrate in shape; including eye width wider than pronotum; integument shiny, somewhat punctate to smooth; eyes small, ovoid in shape, feebly faceted, weakly emarginate anteriorly, not bulging laterally; antennae with 11 antennomeres; antennomeres 5-11 to 6-11 expanded, compressed laterally; frons conspicuously wide, much wider than eye width, bi-impressed or not; terminal labial palpi subsecuriform; terminal maxillary palpi cylindrical, compressed laterally.

Thorax: Pronotum smooth to feebly punctate, inconspicuously widest at middle, sides subparallel. Prosternum smooth to slightly punctate. Mesoventrite moderately punctate. Metaventrite smooth, glabrous to conspicuously vested; metaventral process impressed to almost absent. Metepisternum concealed throughout its length in lateral view.

Elytra: Elongate; subparallel; inconspicuously widest behind middle; surface shiny to feebly punctate, punctations may extend to posterior third but never reach apex; scutellum ovoid, not compressed; vested to devoid of vestitures; epipleural fold complete, narrowing toward apex.

Legs: Feebly rugose; profemora not swollen; tibial spur formula 4-4-4; pulvillar formula 4-4-4; pulvilli weakly developed; two tarsal denticles; tarsal denticles digitiform in shape; moderately vested.

Abdomen: Six visible ventrites. Ventrites 1-5 impressed laterally or not; pygidium of males slightly differentiated from that of females; males with sixth ventrite emarginate or not; sixth ventrite of females simple, broadly rounded to rather subquadrate (Fig. 16D). Male and female pygidium shape similar.