Tachyusa apicipennis Cameron, 1939

Pa ṡnik, Grzegorz, 2006, A revision of the World species of the genus Tachyusa Erichson, 1837 (Coleoptera, Staphylinidae: Aleocharinae), Zootaxa 1146, pp. 1-152 : 59-60

Tachyusa apicipennis Cameron, 1939 ( Figs. 45–47)

Tachyusa apicipennis Cameron, 1939: 266 .

Type material. Holotype: ♂: [ India], United Prov. , Rohatgaon, T. apicipennis Cam. Type ( BMNH).

Additional material. Thailand: Sri Satchaneki , 13.X.1979, Rougemont, 2 exx ( GRPC) ; 1 ex ( MSNV); Vietnam: 180 km SSW Hanoi, 40 km SW Than Hoa, Ben En National Park , 9–15.VIII.1997, A. Napolov, 1 ex ( NMEG) .

Redescription. Body. Length 3.4–3.9 mm, convex, parallel­sided, glossy; body colour dark brown to black, legs reddish brown, tarsi yellow, antennae brown with antennomeres 1–3 red.

Head circular in outline; convex, narrowly and moderately deeply impressed medially; eyes large, moderately protruding from lateral contours of head, length of each seen from above longer than postocular region; surface of head with obsolete isodiametric mesh microsculpture; puncturation fine and moderately dense. Antennae long, slightly increasing in width apically, antennomere 3 longer than 2, antennomeres 4–10 longer than wide, decreasing in length, antennomere 11 nearly conical.

Pronotum quadrate, lateral sides clearly concavely narrowed to obtuse hind angles; before base with small and shallow transverse impression; broadly and moderately deeply impressed medially; surface without microsculpture; puncturation relatively coarse, dense and asperate; pubescence at midline directed posteriorly.

Elytra subquadrate, at suture slightly shorter than pronotal length at midline; surface lacking microsculpture; puncturation fine, dense and weakly asperate.

Abdomen dilated posteriorly, bases of tergites 3–5 each with deep transverse impression, impressions with 7–8 longitudinal ridges connected by the short transverse ridges in the shape of honeycomb; tergal puncturation very fine and very scattered, punctures very small and scarcely visible, surface without microsculpture.

Male. Aedeagus as in Figs. 45–46.

Female. Spermatheca as in Fig. 47.

Remarks. From the other oriental species, Tachyusa apicipennis is distinguished by its larger size, the slenderer antennae, the antennomere 3 longer than 2 and by the shape of the genitalia.

Distribution. Based on the revised records, T. apicipennis is known from India,

Thailand and Vietnam.