1. Imbecilla bifurca Cao & Dmitriev sp. nov.

(Figs 10, 25 m–p)

Description. Ground color off white, infused with brown (specimens preserved in ethanol before examination), eyes grey. Head wider than pronotum. (Figs 25 m–p)

Pygofer lobe (Fig. 10c) with dorsal margin angulately emarginate, hind margin truncate; dorsal appendage (Figs 10c, d) with additional thin process on dorso-caudal angle, directed ventrad. Subgenital plate (Figs 10c, f) with about 3 macrosetae, with peg-like setae from subbase to middle and rigid setae from subbase to apex. Style (Fig. 10g) with second extension very long and curved mesad, with setae on preapical lobe and sensory pits basally on middle part. Connective (Fig. 10h) with manubrium wide, central lobe convex on apical margin. Aedeagal shaft (Fig. 10i, j) slender, curved subbasally; preatrial processes longer and thicker than shaft, apices slightly bifurcated; gonopore terminal on ventral side.

Measurement. Male length 2.50mm, female length 2.75mm.

Material examined. Holotype: ♂, REPUBLIC OF CONGO, Dept. Pool, Iboubikro site, Lesio-Loun Pk, 340m, 03°16.196'S, 015°28.267'E, 25.viii.2008, coll. Braet & Sharkey. Paratypes: 2♂, same data as holotype except 29.viii.2008 .

Etymology. The specific epithet is derived from Latin adjective “ bifurcus ” which means forked, referring to the forked preatrial processes.

Diagnosis. This species is very similar to I. debilis Dworakowska, 1970a, but the pygofer dorsal appendage is shorter and has an additional process close to the basal appendage, the aedeagal shaft is curved and the preatrial processes are bifurcated apically.