Tachyusa approximans Pace, 1984

Pa ṡnik, Grzegorz, 2006, A revision of the World species of the genus Tachyusa Erichson, 1837 (Coleoptera, Staphylinidae: Aleocharinae), Zootaxa 1146, pp. 1-152 : 69-70

Tachyusa approximans Pace, 1984 ( Fig. 61)

Tachyusa (Caliusa) approximans Pace, 1984: 440 .

Type material. Holotype: ♂: N. Thailand, r. Kok , ca. 30 km W Chien Grai, 12.II.1982, G. Rougemont ( MSNV).

Redescription. Body. Length 2.7 mm, convex, parallel­sided, glossy; head pitchy brown, pronotum reddish yellow, elytra brownish red, abdomen red with tergites 5–6 black, legs yellowish red, antennae brown with antennomeres 1–3 red.

Head transverse; convex, eyes large, strongly protruding from lateral contours of head, length of each seen from above longer than postocular region; surface of head lacking microsculpture; puncturation fine and dense. Antennae short, clearly increasing in width apically, antennomere 3 shorter than 2, antennomeres 4–8 elongate, antennomeres 9–10 quadrate, antennomere 11 nearly conical.

Pronotum quadrate, lateral sides clearly concavely narrowed to obtuse hind angles; before base with deep transverse impression; surface without microsculpture; puncturation relatively coarse, dense and asperate; pubescence at midline directed posteriorly in apical half and anteriorly in basal half.

Elytra subquadrate, at suture as long as pronotal length at midline; surface lacking microsculpture; puncturation very fine, pinprick­like and relatively sparse.

Abdomen dilated posteriorly, 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.

Male unknown.

Female. Spermatheca as in Fig. 61.

Remarks. Tachyusa approximans is similar to T. cephalotes , from which it differs by the red pronotum, the abdomen red with tergites 5–6 black, the temples broadly rounded to neck and by the shape of the spermatheca.

Distribution. T. approximans is known so far only from its type locality.