Lebioderus thaianus

Diagnosis
This species is very similar to L. candezei Dohrn, 1888, from Kalimantan (Borneo), L. percheroni Westwood, 1874, from Peninsular Malaysia, and L. ritsemae Gestro, 1901, from Sumatera in the shapes of antennae, pronotum, and legs, but it is easily distinguished from them by its smaller body, non-protruding temples, and evidently shorter 2nd dorsal denticle of the 2nd antennal segment

Description
Body (Fig. 1) small, shining, dark brown, but mouthparts and legs slightly paler. Head with a shallow longitudinal groove medially; frons gently rounded; temples weakly protruded laterad; surface smooth, sparsely covered with minute setae. Second segment of antennae (fused 2nd to 11th segments) not well articulated except for 1st article; 2nd dorsal denticle (Fig. 1: arrow) short; 3rd dorsal denticle shorter than 4th, almost as long as 5th; 1st ventral projection rounded at apex; 2nd to 4th ventral projections shallowly emarginate; 5th ventral projection small, rounded; 6th ventral projection minutely convex with a few small setae at apex. Pronotum broad (W/ L=2.05-2.15); lateral projection well convex above, rounded at apex; surface smooth, moderately with short setae. Elytra with 8-10 pairs of long setae on lateral margins of apical half; surface smooth, moderately with short setae. Legs thin; tibiae slightly dilated apicad, curved outwards. Aedeagus (Figs. 2, 3): apical inner part of median lobe margined; internal sac with a subtriangular sclerite; apices of parameres reach apical margin of median lobe.

Distribution
East Thailand (Khao Yai National Park).

Biology
Six specimens of this species were collected in flight interception traps at two sites in Khao Yai National Park during the rainy season.