Tachyusa nilensis 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 : 86-87

Tachyusa nilensis Pa ś nik, sp. n. ( Figs. 82–84)

Type material. Holotype: ♂: [ Sudan], Soudan­Egyptien, Roseires, Haut Nil Bleu, 1907, Ch. Alluaud ( MNHN) . Paratypes: 4♂♂ and 3♀♀: same data as the holotype ( MNHN) ; ♂ and ♀: same data as the holotype ( ISEA) .

Description. Body. Length 2.5–2.8 mm, convex, parallel­sided, glossy; body colour brown, legs yellow, antennae red.

Head circular in outline, convex, glossy, narrower than pronotum, widest across eyes; eyes large, moderately protruding from lateral contours of head, length of each seen from above subequal to that of postocular region; surface of head without microsculpture; puncturation fine and dense; pubescence short and sparse, directed inward. Antennae long, clearly increasing in width apically, antennomeres 2 and 3 subequal in length, antennomeres 4–8 longer than wide, antennomeres 9–10 sexually dimorphic, quadrate in male and longer than wide in female, antennomere 11 nearly conical.

Pronotum quadrate, convex, glossy, widest in apical third, lateral sides weakly concavely narrowed to obtuse hind angles; before base with small and shallow transverse impression; surface without microsculpture; puncturation relatively coarse, dense and asperate; pubescence at midline directed posteriorly.

Elytra subquadrate, wider than pronotum, lateral sides arcuate, at suture as long as pronotal length at midline; surface lacking microsculpture; puncturation fine, dense and weakly asperate.

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

Male. Aedeagus as in Figs. 82–83.

Female. Spermatheca as in Fig. 84.

Remarks. See under T. boopina .

Etymology. The name nilensis refers to the type locality.

Distribution. The new species is known so far only from the type locality in Sudan.