Igerna Kirkaldy, 1903

C. A. Viraktamath, 2011, Revision of the Oriental and Australian Agalliini (Hemiptera: Cicadellidae: Megophthalminae) 2844, Zootaxa 2844, pp. 1-118 : 62-63

Key to Oriental species of Igerna Kirkaldy

1. Head, apices and bases of pronoutm and forewing claval veins and sutures, excluding black areas red ( Indonesia: Java)............................................................................. Igerna nigrita (Melichar) comb. nov.

- Coloration ochraceous with dark brown or black spots or areas, lacking red areas................................... 2

2. Connective with posterior margin extending beyond base of aedeagal shaft thus appearing fused with aedeagus ( Figs 329, 337,371)............................................................................................ 3

- Connective not as above; aedeagus articulated with connective ( Fig.288).......................................... 5

3. Pygofer lobe rounded caudally without spine-like prjctions ( Fig. 375–376), anal collar dorsally curved hook, often forked; aedeagal shaft slender, elongate, process branched, ventrally directed ( Fig.371–374) ( India: Nilgiri Hills)...................................................................................................... I. violacea (Distant)

- Pygofer lobe with two spine-like projections ( Figs 328, 335)................................................... 4

4. Pygofer spines widely separated ( Fig. 328); anal collar neither hook-like nor forked; aedeagal shaft stout, processes directed caudally ( Fig. 329) ( Nepal)............................................................... I. quinlani sp. nov.

- Pygofer spines close together ( Fig. 335); anal collar S-shaped ( Fig. 336); aedeagal shaft slender, processes directed ventrally ( Fig. 337) ( India: Sikkim)................................................................... I. keyae sp. nov.

5. Pygofer lobe produced into attenuated apically bifid process with basal tooth ( Fig.306) ( India: Sub-Himalayan region)...................................................................................... I. darjeelingensis sp. nov.

- Pygofer lobe variable, if dorsally produced into an attenuated process not bifid ( Figs 352, 353)........................ 6

6. Pronotum with large triangular black spot ( Figs 321, 360); pygofer with mesal lobe armed with one or two spines ( Figs 322, 362)................................................................................................ 7

- Pronotum with two black spots or entirely black; male pygofer mesal lobe when present not as above................... 8

7. Male pygofer with mesal lobe armed with two spines ( Fig. 323), aedeagal shaft with two lateral asymmetrical processes surrounding gonopore and shaft produced beyond ( Figs 325, 326) ( India: Kurseong)................ I. himalayensis sp. nov.

- Male pygofer mesal lobe armed with one spine ( Fig. 364); aedeagus with two subapical and preatrial processes ( Figs 365, 367) ( India: Sikkim)......................................................................... I. sikkima sp. nov.

8. Aedeagal shaft with subapical tooth ( Figs 319, 320); style robust, elongate ( Fig.318) ( Samoa).......... I fasciata (Osborn)

- Aedeagal shaft without subapical tooth; style slender of normal size ( Fig. 294)................................... 9

9. Pygofer lobe caudo-dorsally produced ( Fig. 352, 353)....................................................... 10

- Pygofer lobe not produced caudo-dorsally ( Figs 286, 292383)................................................. 11

10. Aedeagal shaft sinuate, S-shaped in caudal view, with an apical bifurcate, caudo-ventrally directed processes ( Figs 355, 356) (south India; Sri Lanka)............................................................ I. quadrinotata (Melicahr)

- Aedeagal shaft straight, aedeagal process with inner arm, laterally toothed ( Figs 314, 315) ( India: Kodaikanal)................................................................................................ I. delineata sp. nov.

11. Aedeagus complex, with ventral atrial process, shaft with pair of basal processes and pair of subapical teeth-like processes ( Figs 388, 389, 390)) ( India; Darjeeling)..................................................... I. wilsoni sp. nov.

- Aedeagus simpler, without ventral atrial process or with basal preatrial processes.................................. 12

12. Anal collar process long, slender with forked apex; dorsal margin of pygofer dark pigmented ( Figs 346, 349); aedeagal shaft with ventrally directed short, apical process ( Fig. 348)( Nepal).................................. I. priyankae sp. nov.

- Anal collar simple, not forked; pygofer without differential dark pigmentation ( Fig. 386); aedeagal shaft with a pair of lateral apically forked processes directed ventrally ( Figs 288, 296)................................................... 13

13. Male styles slender ( Fig. 294), subgenital plates more acutely pointed, inner margins parallel sided ( Fig. 287) ( Sri Lanka).................................................................................... I. atrovenosa (Melichar)

- Male styles robust ( Figs. 299, 300); subgenital plates elongate, broadly rounded at apex and inner margins divergent ( Fig. 293) (Sunda Islands).......................................................................... I. aurora sp. nov.