Tachyusa cordicollis Bernhauer, 1902

Pa ṡnik, Grzegorz, 2006, A revision of the World species of the genus Tachyusa Erichson, 1837 (Coleoptera, Staphylinidae: Aleocharinae), Zootaxa 1146, pp. 1-152 : 67-68

Tachyusa cordicollis Bernhauer, 1902 ( Fig. 57)

Tachyusa cordicollis Bernhauer, 1902: 23 .

Tachyusa (Caliusa) cordicollis: Fenyes, 1920: 173 ; Bernhauer & Scheerpeltz, 1926: 586; Cameron, 1939: 265.

Type material. Holotype: ♀: Ceylon, Anuradhapura , Tachyusa cordicollis Bh. Type, Horn ( FMNH).

Redescription. Body. Length 2.3 mm, convex, parallel­sided, glossy; body colour dark brown, abdominal tergites 3–4 brownish red, legs yellow, antennae 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 moderately dense. Antennae short, clearly increasing in width apically, antennomeres 2 and 3 subequal in length, 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 very fine, pinprick­like, moderately dense and weakly 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, relatively sparse and weakly asperate; postero­lateral angles broadly rounded.

Abdomen dilated posteriorly, bases of tergites 3–5 each with deep transverse impression, impressions with 4–5 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. 57.

Remarks. Tachyusa cordicollis is similar to T. elegans , from which it can be distinguished by having a smaller body size, the pronotum and tergites 3–4 brownish­red, the pronotum less convex, and by the shape of the aedeagus.

Distribution. T. cordicollis is known only from the type locality in Sri Lanka.