Key to species of Drabescus from the Indian subcontinent (males)

[Male sex of D. stramineus not known]

1. Pygofer with a spine-like apical process, ventral margin almost straight and not dentate.............................. 2

- Pygofer without spine-like process, ventral margin concave with dentate margin (Figs 7 AB; 8AB)..................... 6

2. Aedeagus with basal processes on the shaft in dorsal or ventral view (Figs 6E; 9G; 10G; 12F)......................... 3

- Aedeagus without basal processes on the shaft, in lateral view shaft expanded in distal half (Fig. 11D)................................................................................................... D. nigrofacialis (Distant)

3. Aedeagus with lateral processes divergent in dorsal or ventral view (Figs 9D; 10E; 12D)............................. 4

- Aedeagus with lateral process convergent apically in dorsal or ventral view (Figs 6E; 12 FG)......................... 5

4. Aedeagal shaft with lateral processes more than 0.75 as long as shaft, arising at base (Figs 10 EGH)................................................................................................. D. nervosopunctatus Signoret

- Aedeagal shaft with lateral processes about 0.33 as long as shaft, arising about 0.33 distance from base of shaft (Figs 9 DE)...................................................................................... D. limbaticeps (Stål)

5. Style with poorly-developed angular subapical lobe (Fig. 6C); lateral processes of aedeagal shaft extending to top of aedeagus in ventral view (Fig. 6F)............................................................... D. angulatus Signoret

- Style with well-developed more or less rounded subapical lobe (Fig. 12E); lateral processes of aedeagal shaft not extending to top of aedeagus in ventral view (Fig. 12F).................................................. D. shillongensis Rao

6. Pronotum and mesonotum predominantly orange brown (Figs 1G–J); aedeagus including dorsal apodeme U-shaped, basal processes of shaft about 0.66 as long as shaft in lateral view (Fig. 8H), in dorsal view weakly divergent from shaft (Figs 8 EF)....................................................................................... D. kempi Pruthi

- Pronotum and mesonotum predominantly black or dark brown (Figs 1EF); aedeagus including basal apodeme V-shaped, basal processes of shaft about half as long as shaft in lateral view (Fig. 7 GH), in dorsal view strongly divergent from shaft (Figs 7 EF)............................................................................ D. austroindicus sp. nov.