3. Imbecilla spinalis Cao & Dmitriev sp. nov.

(Figs 11, 25 u–x)

Description. Ground color yellowish-brown (specimens preserved in ethanol before examination). Anterior part of vertex, frontoclypeal area and anteclypeus black, lorum and gena dark brown, eyes grey. Pronotum with midline and hind margin infuscated. Mesonotum with basal triangles light, midline infuscated. Forewing dark with brochosome field dark. Head wider than pronotum. (Figs 25 u–x)

Male abdominal apodemes 2S (Fig. 11c) extended to middle of sternite IV.

Pygofer lobe (Fig. 11d) with dorsal margin angulately emarginate, hind margin truncate; dorsal appendage (Figs 11d, e) nearly triangular, directed ventrad. Subgenital plate (Figs 11d, g) with long, spine-like process subapically, directing inwards, with about 2 macrosetae and reduced marginal rigid setae. Style (Fig. 11h) with second extension moderately long, without setae but sensory pits on preapical lobe. Connective (Fig. 11i) with manubrium narrow, central lobe convex on apical margin. Aedeagal shaft (Figs 11j, k) slender, slightly sinuated, with pair of thin processes basally, as long as shaft, apex serrated; without preatrial processes; gonopore terminal on ventral side.

Measurement. Male length 2.35–2.50mm.

Material examined. Holotype: ♂, REPUBLIC OF CONGO, Dept. Pool, Iboubikro site, Lesio-Loun Pk, 340m, 03°16.196'S, 015°28.267'E, 29.viii.2008, coll. Braet & Sharkey. Paratypes: 1♂, same data as holotype; 3♂, same data except 25.viii.2008; 1♂, same data except 12–18.viii.2008.

Etymology. The specific epithet is derived from Latin adjective “ spinalis ” which means spined, referring to the spine-like process of the subgenital plate.

Diagnosis. This species is unique within the genus in having a spine-like process on the subgenital plate. It lacks the preatrial processes, but has a pair of long basal processes on the aedeagus.