Rabdotodrusilla pectinata spec. nov.

(Figs 123–125, 380–383)

Type material: Holotype ♂: “ Thailand – Chiang Mai, Doi Suthep 1120 m. Barber F. I.86, P. Schwendinger / Holotypus ♂ Rabdotodrusilla pectinata sp. n., det. V. Assing 2015” (MHNG).

Paratype ♂ [damaged]: same data as holotype (cAss) .

Etymology: The specific epithet is an adjective derived from the Latin noun pecten (comb) and alludes to the shape of the posterior margin of tergite VIII.

Description: Body length 4.2 mm; length of forebody 1.8 mm. Coloration: head and pronotum dark-brown; elytra pale-brown with the postero-lateral portions extensively dark-brown; abdomen pale reddish-brown with segment VI infuscate; legs yellowish, with the tibiae infuscate; antennae brown with antennomeres I–II and the apex of XI paler; maxillary palpi yellowish-red with yellowish palpomere IV.

Head (Fig. 123) transverse, approximately 1.17 times as broad as long; punctation rather sparse and fine; pubesence long, pale, and depressed to sub-erect. Eyes large, longer than distance from posterior margin of eye to posterior constriction of head. Antenna (Fig. 124) rather massive, 1.5 mm long; antennomere I stout, barely twice as long as broad; II short, distinctly less than twice as long as broad; III nearly twice as long as II and more than twice as long as broad; IV very weakly transverse; V–X gradually increasing in width and increasingly transverse; IX–X more than 1.5 times as broad as long; XI nearly as long as the combined length of VIII–X.

Pronotum (Fig. 123) approximately 1.07 times as broad as long and 1.1 times as broad as head; posterior margin obtusely produced in the middle; disc matt and with dense, long, and straight longitudinal striae in posterior three-fourths, anteriorly and in antero-lateral portions more glossy and with granulose punctation.

Elytra (Fig. 123) approximately 0.8 times as long as pronotum; punctation very fine and dense. Hind wings present. Metatarsomere I approximately as long as the combined length of II–III.

Abdomen (Fig. 125) narrower than elytra; tergites III– VII each with a row of setiferous punctures at posterior margin, otherwise nearly impunctate, without microsculpture; posterior margin with palisade fringe.

♂: tergite VIII (Fig. 382) transverse, posterior margin with a pronounced lateral tooth-like projection on either side, between these projections with 15 conspicuous spine-shaped processes (somewhat resembling a comb); sternite VIII (Fig. 383) transverse and with weakly convex posterior margin; median lobe of aedeagus (Figs 380–381) approximately 0.55 mm long, with internal structures of distinctive shapes.

♀: unknown.

Comparative notes: This species is readily distinguished from R. malaysiensis by several external characters alone, particularly its larger body size ( R. malaysiensis: 2.7 mm), much more massive antennae with transverse antennomeres IV–X ( R. malaysiensis: antennomeres IV–IX oblong), the different coloration of the femora ( R. malaysiensis: bicoloured, brown with yellow bases), and the absence of microsculpture on the elytra and the abdomen. For illustrations of R. malaysiensis see PACE (2013).

Distribution and natural history: The type locality is situated in Doi Suthep, North Thailand. The specimens were collected with pitfall traps at an altitude of 1120 m.