Tachyusa javana Cameron, 1940

Pa ṡnik, Grzegorz, 2006, A revision of the World species of the genus Tachyusa Erichson, 1837 (Coleoptera, Staphylinidae: Aleocharinae), Zootaxa 1146, pp. 1-152 : 60-62

Tachyusa javana Cameron, 1940 ( Figs. 48–50)

Tachyusa javana Cameron, 1940: 105

Type material. Holotype: ♀: East Java, Djember, Tachyusa javana Cam. Type ( BMNH).

Additional material. Borneo: Sarawak, 2nd Division Skrang River , XI.1975, G. de Rougemont, 2 exx ( BMNH) . Indonesia: Irian Jaya, Nabire distr., Wondi­woi Mts., Yeretua , 100 m, IX.1998, M. Balke, 4 exx ( NMEG) ; 2 exx ( ISEA); Sulawesi Utara, Danau Mooat, 1200 m, near Kotamobagu , 17.XII.1985, 2 exx ( BMNH) ; Sulawesi Utara, Dumoga­Bone National Park, banks of River Tumpah , lowland forest, 200–300 m, XII.1985, 1 ex ( BMNH) . Philippines: Mindanao , Davao Prov., 25 km W New Bataan, 1200 m, 20–22.V.1996, Bolm, 1 ex ( SMNS) .

Redescription. Body. Length 2.9–3.3 mm, convex, parallel­sided, glossy; head brown to pitchy brown, pronotum red, elytra brownish red with shoulders and posterior margin red, abdomen black with two basal tergites red, legs yellow, antennae brown with antennomeres 1–3 red.

Head circular in outline; flattened dorsally, moderately broadly and shallowly 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 distinct isodiametric mesh microsculpture; puncturation fine and moderately dense. Antennae short, moderately 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 clearly concavely narrowed to obtuse hind angles; before base with small and shallow transverse impression; surface with isodiametric mesh microsculpture; puncturation fine, moderately dense and asperate; pubescence at midline directed posteriorly.

Elytra subquadrate, at suture as long as 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 scattered, punctures very small and scarcely visible, surface without microsculpture.

Male. Aedeagus as in Figs. 48–49.

Female. Spermatheca as in Fig. 50.

Remarks. Tachyusa javana is very similar to T. schawalleri , from which it can be distinguished by the red pronotum, the antennomeres 2 and 3 subequal in length, the yellow legs and particularly by the shape of the genitalia.

Distribution. Oriental species known from Indonesia, Malaysia and Philippines.