Tribe Issini Spinola, 1839

Key to Issini genera of China and neighbouring countries:

1. Hind wing more or less reduced, single-lobe (Fig. 1 B) ……………………………………………2 – Hind wing well developed, trilobed (Figs 2 D–F, 4F) ………………………………………………6

Postclypeus expanded into a short nasale (Fig. 3 B) ………………………………………………3 –

Postclypeus flattened, not expanded into short nasale ……………………………………………4

Frons elongate (Gnezdilov 2014: fig. 1C–D), hind tibia distally with a single lateral spine ………………………………………………………………………… Tapirissus Gnezdilov, 2014 –

Frons slightly wider than long (Fig. 3A), hind tibia with two lateral spines … Eusudasina Yang, 1994

Tegmen with longitudinal veins indistinct, hind wing slighty shorter than tegmen ……………5 – Tegmen with longitudinal veins distinct, hind wing tiny (Fig. 1A –B; Gnezdilov et al. 2014b: pl. 23, figs a–c) ……………………………………………………………… Celyphoma Emeljanov, 1971

Frons with a row of submarginal pustules laterally, median carina absent (Gnezdilov & Constant 2012: figs 7–9) …………………………………………………………………… Euxaldar Fennah, 1978 – Frons smooth, without pustules laterally, median carina distinct (Chen et al. 2014: figs 2-35E, 2-36E) …………………………………………………… Neohemisphaerius Chen, Zhang & Chang, 2014

Vertex or frons distinctly protuberant forward, approximately triangular …………………………7 –

Vertex and frons not protuberant forward, nearly quadrangular ……………………………………9

Vertex protruding forward; frons with median carina, flat …………………………………………8 –

Vertex transverse, frons with no median carina, protruding like a cone in its upper part(Gnezdilov2012: fig. 1A–C) ………………………………………………………………… Vishnuloka Distant, 1906

8. Vertex more than 3.0 times longer than wide, apex upcurved (Fig. 1 C) …………………………

………………………………………………………… Pseudochoutagus Che, Zhang & Wang, 2011 – Vertex less than 2.0 times longer than wide in midline, apex nearly horizontal (Fig. 1 E) …………… ……………………………………………………… Macrodarumoides Che, Zhang & Wang, 2012

Hind wing with anal lobe rudimentary (Fig. 2 E), or vannus and anal lobe both reduced, CuA2 and CuP not fused and thickened at apex (Fig. 2 F) ………………………………………………10 – Hind wing with vannus and anal lobe both well-developed, CuA2 and CuP fused and thickened at apex (Fig. 4 F) ……………………………………………………………………………………14

10. Hind wing with anal lobe very small, remigium and vannus well-developed, separated by deep cleft, veins reticulate (Fig. 2 E); frons with transverse carina below upper margin (Fig. 3 C) ……11 – Hind wing with vannus and anal lobe small, separated with vannus by relatively shallowly cleft, veins not reticulate (Figs 2 F, 7B); frons without such transverse carina ………………………………12 11. First metatarsomere with more than 35 intermediate spines; suspensorium large, nearly reaching to the apex of phallobase; the base of ventral margin of phallobase strongly angulately convex ……………………………………………………………………………… Gelastyrella Yang, 1994

– First metatarsomere with 8–10 intermediate spines; suspensorium small, situated at base of aedeagus; the base of ventral margin of phallobase not convex (Gnezdilov 2009: figs 1–3) ……… ………………………………………………………………………………… Thabena Stål, 1866

12. Frons with distinct sublateral carinae crossed with feeble median carina far below upper margin, nearly rectangularly enlarged above clypeus, the transverse border lined with white and ridged, the upper line in middle of frons and the lower line above frontoclypeal suture (Fig. 6 C) …………………………………………………………………………… Neokodaiana Yang, 1994 – Frons without such sublateral carinae and white ridged lines ……………………………………13 13. Genital style with a large hooked process below capitulum of style; aedeagus with two pairs of ventral hooks; lateral lobe of phallobase blunt at apex, lateral margin dentate in ventral view (Fig. 3 E–G) …………………………………………… Dentatissus Chen, Zhang & Chang, 2014

– Genital style without such process, aedeagus with a pair of ventral hooks, lateral lobe of phallobase with apex extended to spinal process curved cephalad, lateral marign smooth (Fig. 3 H–I) ……… …………………………………………………………………………… Kodaianella Fennah, 1956

14. Frons and clypeus with strong median carina (Gnezdilov et al. 2015: fig. 21) …… Tetrica Stål, 1866 – Frons with long or short median carina, clypeus without median carina …………………………15

15. Tegmen with Sc fusing with R slightly basad of wing mid-point, forming a loop (Fig. 2 A; Gnezdilov 2013b: fig. 3) ………………………………………………………………… Sarima Melichar, 1903 – Tegmen without such loop vein ……………………………………………………………………16 16. Tegmen with ScP short, not reaching beyond midlength of tegmen (Fig. 2 B) ………………………17 – Tegmen with ScP long, distinctly reaching beyond midlength of tegmen (Fig. 2 C) …………………22

17. Frons with sublateral carinae crossing distinct ……………………………… Sinesarima Yang, 1994 – Frons with sublateral carinae absent or feeble ……………………………………………………18

18. Tegmen with MP branched near apical ¼, well beyond the furcation of CuA (Fig. 2 B) …………… ………………………………………………………………………… Sarimodes Matsumura, 1916 – Tegmen with MP branched near middle before the furcation of CuA ……………………………19

19. Aedeagus with long ventral hooks ………………………………………… Neosarima Yang, 1994 – Aedeagus without long ventral hooks ……………………………………………………………20

20. Frons with feeble sublateral carinae (Chen et al. 2014: fig. 2-82E) ………………………………… …………………………………………………………… Yangissus Chen, Zhang & Chang, 2014 – Frons without sublateral carinae (Fig. 4 C) …………………………………………………………21

21. Tegmen with hypocostal plate …………………………… Dactylissus Gnezdilov & Bourgoin, 2014 – Tegmen without hypocostal plate (Fig. 4 D) ………………………… Orbita Meng & Wang, gen. nov.

22. Frons almost twice longer than wide; clypeus with lower part of postclypeus and anteclypeus with median triangular projection (Gnezdilov 2014: figs 4–5) ……… Darwallia Gnezdilov, 2010 – Frons slightly wider than long; clypeus flattened, without such projection ………………………23

23. Vertex a little longer than wide; frons with obscure median carina ………… Jagannata Distant, 1906 – Vertex distinctly wider than long; frons clearly tricarinate …………………………………………24

24. Frons with median carina and sublateral carinae present at basal half, slightly above middle, indistinctly transversely elevated on the surface (Chan & Yang 1994: fig. 39B) ……… Parasarima Yang, 1994 – Frons with distinct median and sublateral carinae, reaching over middle, flattened on the surface (Fig. 3 D) ……………………………………………………………………… Eusarima Yang, 1994