Drabescus, Stal, 1870

Viraktamath, C. A., Webb, M. D. & Yeshwanth, H. M., 2022, Review of the leafhopper genus Drabescus Stål (Hemiptera: Cicadellidae: Deltocephalinae) in the Indian subcontinent with description of one new species, Zootaxa 5128 (2), pp. 225-247 : 227

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.

Figures

FIGURES 6 A–F. Drabescus angulatus Signoret, male genitalia.A, pygofer and anal tube, lateral view; B, valve and subgenital plates, dorsal view; C, style and connective, dorsal view; D, aedeagus, lateral view; E–F, aedeagus, dorsal and ventral views.

FIGURES 7A–H. Drabescus austroindicus sp. nov., male genitalia.A, male genital capsule, lateral view; B, pygofer, anal tube, valve and subgenital plates, lateral view; C. distal half of pygofer, ventral view; D. valve and subgenital plates, dorsal view; E, styles, connective and aedeagus, dorsal view; F, connective and aedeagus, ventral view; G–H, aedeagus, lateral view.

FIGURES 8 A–I. Drabescus kempi Pruthi, male genitalia. A, genital capsule, lateral view; B, pygofer, anal tube, valve and subgenital plate, lateral view; C, distal half of pygofer ventral view; D, valve and subgenital plate, dorsal view; F, aedeagus, lateral view;; G, styles, connective and aedeagus, dorsal view; H, aedeagus lateral view; style, I, connective and aedeagus, lateral view.

FIGURES 9 A–G. Drabescus limbaticeps (Stål), male genitalia.A. pygofer and anal tube, lateral view; B, pygofer, lateral view; C,, valve and subgenital plates, dorsal view; D, styles, connective and aedeagus, dorsal view; E, aedeagus, lateral view; F, style, connective, and aedeagus, lateral view; G, aedeagus, dorsal view.

FIGURES 10 A–H. Drabescus nervosopunctatus Signoret, male genitalia. A, pygofer, anal tube and subgenital plates, lateral view; B, pygofer, lateral view; C, distal half of pygofer, ventral view; D, valve subgenital plates and style, dorsal view; E, styles, connective and aedeagus, dorsal view; F, aedeagus, lateral view; G–H, connective and aedeagus, dorsal and ventral views.

FIGURES 11 A–E. Drabescus nigrofacialis (Distant), male genitalia. A, pygofer and anal tube, lateral view; B, valve and subgenital plate, dorsal view; C, styles, connective and aedeagus, dorsal view; D–E, aedeagus, ventral and lateral views.

FIGURES 12 A–H. Drabescus shillongensis Rao, male genitalia. A, pygofer and anal tube, lateral view; B, valve, dorsal view; C, subgenital plate, dorsal view; D, style, connective and aedeagus, ventral view;; E, styles and connective dorsal view; F–G, aedeagus, dorsal and ventral views; H, aedeagus, lateral view.