Key to genera of Gryllacrididae

1. Male with a pair of enlarged and strongly upwardly extending whiskers on tenth abdominal tergite (Fig. 2A, B)....................2

- Whiskers on male tenth abdominal tergite absent or extended downwards (Figs 2C–L, 5A–F, 7A–L, 10A–F).......................3

2. Ovipositor straight, longer than hind femur (Fig. 3B)...................................................................... Diaphanogryllacris Karny 1937

- Ovipositor upwardly curved, shorter than hind femur (Fig. 3D)...................................................... Microlarnaca Gorochov 2004

3. Wingless (Figs. 3A, C, E, G); spines on hind tibia tiny or completely reduced (Fig. 4A–E) ..........................................................4

- Mostly wings present (Figs 3F, 6A–F, 8A–I, 9A–H, 11A–F), if wingless then extremely elongated spines present in the middle of hind tibia (Figs 3H, 4F)..............................................................................................................................................................5

4. Male subgenital plate without styli (Fig. 5D, E).................................................................................. Apterolarnaca Gorochov 2004

- Male subgenital plate with styli (Fig. 5F) .............................................................................. Tenuigryllacris Li, Yin & He gen. nov.

5. Male ninth abdominal tergite undivided; male tenth abdominal tergite with spines (if male tenth abdominal tergite without spines, male ninth abdominal tergite expanded a pair of spines in the middle closely or from the root) (Figs 2 C-L and 10A–F)..............................................................................................................................................................................................................6

- Male ninth abdominal tergite divided caudally into two lobes (if male ninth abdominal tergite undivided, the spines expanded from the posterior margin pointing upwards or downwards), or with a large projection; male tenth abdominal tergite without spines (Figs 5A–C, 7A–L) ............................................................................................................................................. 15

6. Antennal socket generally colourless, if lateral margin of antennal socket black, then subocular furrow black (Fig. 12C–I); posterior margin of male ninth abdominal tergite extending caudally with a projection on each side of the root, spines on male tenth abdominal tergite not crossing each other or invisible (Figs 2G–L, 10A–F) ................................................................7

- Lateral margin of antennal socket black, subocular furrow colourless (Fig. 12A, B); posterior margin of male ninth abdominal tergite smooth, spines on male tenth abdominal tergite crossing each other (Fig. 2C–F)............ Homogryllacris Liu 2007

7. Wings present (Figs 3F, 11A–F)..................................................................................................................................................................8

- Wings absent (Fig. 3H) ............................................................................................................................... Nippancistroger Griffini 1913

8. Both male ninth and tenth abdominal tergite extended with projections (Fig. 2G, H) ..................................................................9

- Either male ninth or tenth abdominal tergite without projections (Figs 2I–L, 10A–F)............................................................... 10

9. Projections of male ninth and tenth abdominal tergites extremely short and sharp (Fig. 2G) ........................................................ .......................................................................................................................................................................... Furcilarnaca Gorochov 2004

- Projections of male ninth and tenth abdominal tergites long and slender (Fig. 2H) .................. Woznessenskia Gorochov 2002

10. Wings not extended beyond abdomen (Fig. 3F) ..................................................................................... Metriogryllacris Karny 1937

- Wings extended beyond abdomen (Fig. 11A–F).................................................................................................................................. 11

11. Projection S-shaped and extended inwards from the root on each side of posterior margin of male ninth abdominal tergite (Fig. 10A–F)................................................................................................................................................................................................. 12

- Projection truncated and extended inwards from the root on each side of posterior margin of male tenth abdominal tergite, or extended upwards towards the middle and behind (Fig. 2K–L) .................................................................................................. 14

12. Middle of male ninth abdominal tergite sharply convex caudally (Fig. 10A, B) .......................... Phryganogryllacris Karny 1937

- Middle of male ninth abdominal tergite arcuate (Fig. 10C–F).......................................................................................................... 13

13. Veins of forewings darkening, posterior margin of female seventh abdominal sternite flat and undivided (Fig. 10G) ......................................................................................................................................................... Sericgryllacris Li, Yin & He gen. nov.

- Forewings overall yellowish brown, posterior margin of female seventh abdominal sternite with two projecting horns (Fig. 10H, I)............................................................................................................................ Bicornisgryllacris Li, Yin & He gen. nov.

14. Projection truncated and extended inwards from the root on each side of posterior margin of male tenth abdominal tergite (Fig. 2K) ............................................................................................................................................. Siamgryllacris Ingrisch 2018

- Projection extended inwards from the root on each side of posterior margin of male tenth abdominal tergite upwards and towards the middle and behind (Fig. 2L).................................................................................................. Dialarnaca Gorochov 2005

15. Posterior margin of male ninth abdominal tergite with spines extending upwards or downwards from the middle of each lobe (Fig. 5A–C).......................................................................................................................................................................................... 16

- Posterior margin of male ninth abdominal tergite with spines extending inwards from the middle of each lobe, or with a large projection (Fig. 7A–L) ............................................................................................................................................................................... 18

16. Spines protruding from posterior margin of male ninth abdominal tergite pointing downwards (Fig. 5B, C)....................... 17

- Spines protruding from posterior margin of male ninth abdominal tergite pointing upwards (Fig. 5A) ...................................... ............................................................................................................................................................................. Glolarnaca Gorochov 2008

17. Fastigium verticis less than twice as wide as basal segment of antennae (Fig. 13B); spines on male ninth abdominal tergite long (Fig. 5B)................................................................................................................................................... Neolarnaca Gorochov 2004

- Fastigium verticis greater than or equal to twice the width of the basal segment of antennae (Fig. 13C); spines on male ninth abdominal tergite short (Fig. 5C) ................................................................................................................ Haplogryllacris Karny 1937

18. Length of spine extending from male ninth abdominal tergite greater than or equal to half the width of ninth abdominal tergite, or with a large projection (Fig. 7A–E)............................................................................................................................................ 19

- Length of spine extending from male ninth abdominal tergite less than half as wide as abdominal tergite (Fig. 7F–L)............ ......................................................................................................................................................................................................................... 23

19. Spines protruding from posterior margin of male ninth abdominal tergite crossing over each other, or with a large projection (Fig. 7A–D); basal areas of forewings without spots (Fig. 6A–E)..................................................................................................... 20

- Spines protruding from posterior margin of male ninth abdominal tergite not crossed (Fig. 7E); basal areas of forewings with a large, black and yellow spot (Fig. 6F) ................................................................................ Borneogryllacris Karny 1937 stat. resurr.

20. Hindwings light black or completely colourless on each side of cross veins (Fig. 6A–D); the base of spines protruding from posterior margin on male ninth abdominal tergite thinner, or with a large projection (Fig. 7A–C) ......................................... 21

- Lateral margins of hindwings pink or entire hindwings completely smoky (Fig. 6E); base of spines protruding from posterior margin of male ninth abdominal tergite stout and tapered (Fig. 7D).................................................. Capnogryllacris Karny 1937

21. Male ninth abdominal tergite without a large projection (Fig. 7A, B) ............................................................................................. 22

- Male ninth abdominal tergite with a large projection (Fig. 7C) ....................... Ultragryllacris Gorochov and Dawwrueng 2015

22. Each side of cross veins on hindwings black (Fig. 6A); middle of pronotum black (Fig. 13D)....................................................... ..................................................................................................................................................... Marthogryllacris Karny 1937 stat. resurr.

- Each side of cross veins on hindwings colourless (Fig. 6B, C); lateral margin of pronotum black (Fig. 13E, F) ....................................................................................................................................................... Dracogryllacris Li, Yin & He gen. nov.

23. Veins of hindwings partly colourless (if all veins of hindwings black, then cells of hindwings partly or totally black) (Fig. 8A–H) .................................................................................................................................................................................................. 24

- Veins of hindwings black, cells of hindwings transparent (Fig. 8I)................................................................. Larnaca Walker 1869

24. Two lobes of male ninth abdominal tergite hemispherical (Fig. 7F–J)............................................................................................ 25

- Two lobes of male ninth abdominal tergite protruding outwards (Fig. 7K).............................................. Gryllacris Serville 1831

25. Face as a whole generally consistent with body coloration (Fig. 9D–G) ........................................................................................ 26

- Area from facial antennae downwards black (Fig. 9H, 13A)............................................................... Prosopogryllacris Karny 1937

26. Longitudinal veins of hindwings colourless (Fig. 8A–D) ................................................................................................................... 27

- Longitudinal veins of hindwings black (Fig. 8E, F).............................................................. Radigryllacris Li, Yin & He gen. nov.

27. Cells of hindwings black (Fig. 8A–C) ..................................................................................................................................................... 28

- Cells of hindwings colourless (Fig. 8D)............................................................................................................ Eugryllacris Karny 1937

28. Cells of forewings transparent (Fig. 8A, B) ......................................................................... Magnigryllacris Li, Yin & He gen. nov.

- Cells of forewings black (Fig. 8C).............................................................................................................. Ocellarnaca Gorochov 2004