Orthogonius ceylanicus Tian et Deuve, n. sp.

Figs 6–8

Description. Length: 11.5 mm; width: 4.5 mm. Habitus as in Fig. 6.

Head, pronotum, elytra, and underside of head dark brown, underside of thoraces, ventrites, legs, antennae and palps yellow; moderately shiny; head and pronotum faintly wrinkled, impunctate, elytra with dense and very small punctures.

Head wide, HW/HL=1.35. Pronotum much wider than long, PW/PL=1.83, and base wider than front, PbW/ PfW=1.44. Elytra much longer than combined wide, EL/EW=1.45, nearly parallel-sided, widest at a little behind middle. Legs moderately slender, fore tibia slightly expanded in middle, inner angle nearly rectangular.

Male genitalia (Figs 7–8): The median lobe of aedeagus stout and robust, strongly expanded medially on both dorsal and ventral aspects, but less so ventrally, almost 2/7 as thick as long, dorsal opening very long, nearly 2/3 as long as eadeagus; gradually constricted towards apex which is short and broad; apical lamella very short, much broader than that in O. baconii, almost as long as wide, broadly blunt at apex.

Female: Unknown.

Remarks. This new species is distinguished by the male genital structure, which is more or less intermediate between O. baconii and O. nepalensis .

Materials examined. Holotype. ♂, labeled “ Ceylan ”, “C. E. Br.” and “Soc. Ent. Belg.”, from Sri Lanka, deposited in IRSNB.

Etymology. Toponym, it refers to the type locality.

Distribution. Sri Lanka.