Tachyusa vadoni ( Pace, 1999 ) Paṡnik, 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 : 64-65

Tachyusa vadoni ( Pace, 1999) , comb. n. ( Figs. 54–55)

Ischnopoda vadoni Pace, 1999: 79 .

Type material. Holotype: ♂: Madagascar, Maroantsetra , IV.1938, Vadon ( MNHN).

Redescription. Body. Length 2.5 mm, convex, parallel­sided, glossy; head and pronotum red, elytra brownish red, abdomen black with tergites 1–2 red, legs yellow, antennae red.

Head circular in outline, convex, eyes large, moderately protruding from lateral contours of head, length of each seen from above longer than postocular region; surface of head without microsculpture; puncturation very fine, pinprick­like and sparse. Antennae long, slightly increasing in width apically, antennomeres 2 and 3 subequal in length, antennomeres 4–10 longer than wide, antennomere 11 nearly conical.

Pronotum quadrate, lateral sides gradually narrowed in straight line to obtuse hind angles; before base with small and shallow transverse impression; surface lacking microsculpture; puncturation fine, relatively sparse and slightly asperate; pubescence at midline directed posteriorly.

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

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 scattered, punctures very small and scarcely visible, surface without microsculpture.

Male. Aedeagus as in Figs. 54–55.

Female unknown.

Remarks. Tachyusa vadoni is closely related to T. mindoroensis , from which it can be distinguished by having smaller body size, the temples broadly rounded to neck, the pronotal puncturation weakly asperate, and the elytra at suture shorter than pronotal length at midline.

Distribution. Tachyusa vadoni is known so far only from Madagascar.