Tachyusa schillhammeri Pa, 2006

Pa ṡnik, Grzegorz, 2006, A revision of the World species of the genus Tachyusa Erichson, 1837 (Coleoptera, Staphylinidae: Aleocharinae), Zootaxa 1146, pp. 1-152 : 75-76

Tachyusa schillhammeri Pa ś nik, sp. n. ( Figs. 68–69)

Type material. Holotype: ♂: China, NW­Hunan, Wulingyuan, N. Dayong Suoxiyu, 400 m, 31.X.1993, Schillhammer ( NMW).

Description. Body. Length 3.2 mm, convex, parallel­sided, glossy; head brown, pronotum red, elytra brown with shoulders and posterior margin yellowish red, abdomen black with tergites 1–2 red, legs dark brown with tarsi yellow, antennae brown with antennomeres 1–3 red.

Head circular in outline, convex, glossy, narrower than pronotum, widest across eyes; eyes large, strongly protruding from lateral contours of head, length of each seen from above longer than postocular region; surface of head without microsculpture; puncturation fine and moderately dense; pubescence short and moderately sparse, directed inward. Antennae short, slightly increasing in width apically, antennomere 3 shorter than 2, antennomeres 4–10 longer than wide, antennomere 11 nearly conical.

Pronotum quadrate, convex, glossy, widest in apical third, lateral sides clearly concavely narrowed to obtuse hind angles; before base with deep transverse impression; surface lacking microsculpture; puncturation very fine, pinprick­like, moderately dense and slightly asperate; pubescence at midline directed posteriorly in apical half and anteriorly in basal half.

Elytra as long as wide, slightly wider than pronotum, lateral sides arcuate, at suture as long as pronotal length at midline; surface lacking microsculpture; puncturation very fine, pinprick­like and moderately dense.

Abdomen parallel­sided, bases of tergites 3–5 each with deep transverse impression, impressions with 7–8 short longitudinal ridges, tergal puncturation very fine and scattered, punctures very small and scarcely visible, surface without microsculpture; pubescence relatively long and sparse, semierect.

Male. Aedeagus as in Figs. 68–69.

Female unknown.

Remarks. Tachyusa schillhammeri is similar to T. lewisiana , but differs in having the pronotal pubescence at midline directed posteriorly in apical half and anteriorly in basal half, the broadly rounded temples, the antennomere 3 shorter than antennomere 2, the brown legs and in the shape of the aedeagus.

Etymology. The species is dedicated to Harald Schillhammer (Wien), a specialist in Staphylinidae , who collected the new species and made it available for study.

Distribution. The new species is known only from its type locality in China.

The impressa group

The impressa group includes eight species restricted in distribution to the Palaearctic Region and Africa. The group is characterized by the following combination of characters: puncturation of tergites 3–5 relatively sparse; interstices between punctures 3.0–4.0 times their diameter; punctures small but well visible; puncturation of tergites 6–7 slightly denser than that of tergites 3–5; pronotum trapezoid in outline; abdominal pubescence short, sparse and subrecumbent; and the abdomen moderately glossy.