Formosatettix Tinkham, 1937

Deng, Wei-An, Luo, Jie-Ling, Huang, Chao-Mei & Lin, Li-Liang, 2023, Review of the genus Formosatettix Tinkham (Orthoptera: Tetrigidae) with description of new taxa, new synonymy and an updated key to species, Zootaxa 5228 (3), pp. 201-243 : 203-204

Key to the species of Formosatettix Tinkham, 1937

1. Apex of hind pronotal process concave.................................................................... 2

- Apex of hind pronotal process sharp rounded or rounded or widely rounded...................................... 11

2. Lower carinae of middle femora straight.................................................................. 3

- Lower carinae of middle femora undulated................................................................. 4

3. Width of vertex 1.3 times width of eye; lower margin of hind pronotal process straight. Distribution: China (Sichuan).......................................................................... F. nigrimaculatus Lin, Wei & Deng, 2013

- Width of vertex 1.6 times width of eye; lower margin of hind pronotal process curved. Distribution: China (Jiangxi)................................................................................ F. lushanensis Zheng & Yang, 1988

4. Lateral carinae of metazona straight....................................................................... 5

- Lateral carinae of metazona curved....................................................................... 6

5. Lower margin of hind pronotal process straight; frontal ridge between antennae distinct wider than antennal groove diameter. Distribution: China (Henan)......................................................... F. henanensis Liang, 1991

- Lower margin of hind pronotal process curved; frontal ridge between antennae narrower than or equal to antennal groove diameter. Distribution: China (Sichuan)........................................... F. gonggashanensis Zheng, 1992

6. Width of vertex 1.6 times width of eye; middle of posterior margin of female subgenital plate concave. Distribution: China (Hubei)............................................................... .. F. tiantangensis Zheng & Zhong, 2000

- Width of vertex 2–2.5 times width of eye; middle of posterior margin of female subgenital plate with a triangular projecting or with three teeth....................................................................................... 7

7. Antennal grooves inserted below inferior margin of compound eyes; hind pronotal process broad and short...............8

- Antennal grooves inserted between inferior margin of compound eyes; hind pronotal process narrow and short........... 9

8. Frontal costa concave between eyes; lateral (paired) ocelli located in lowest third of compound eye height; posterior half of pronotum with sporadic tubercles; ventral margins of fore femora sinuate and with one or two teeth. Distribution: China (Sichuan)................................................................. F. shuimogouensis Deng , sp. nov.

- Frontal costa straight and not concave between eyes; lateral ocelli located in middle of compound eye height; surface of pronotum smooth; ventral margins of fore femora straight and without tooth. Distribution: China (Yunnan)...................................................................................... F. curvimarginus Zheng & Ou, 2009

9. Width of vertex 2.5 times width of eye; frontal costa in lateral view distinctly concave before eyes. Distribution: China (Hubei).............................................................. F. mufushanensis Zheng & Zhong, 2005

- Width of vertex 2 times width of eye; frontal costa in lateral view straight or slightly concave before eyes.............. 10

10. Frontal costa in lateral view slightly concave before eyes; lower margin of hind process curved. Distribution: China (Yunnan)......................................................................... F. xianggelila Zheng & Ou, 2004

- Frontal costa in lateral view straight before eyes; lower margin of hind process straight. Distribution: China (Yunnan)................................................................................ F. latifemurus Deng , nom. nov.

11. Median carina of pronotum in profile distinct elevated and arch-like........................................... 12

- Median carina of pronotum in profile low and straight or only slightly protruding near the anterior margin.............. 52

12. Frontal costa in lateral view distinctly concave before eyes................................................... 13

- Frontal costa in lateral view straight or slightly concave before eyes............................................ 30

13. Lower margin of hind pronotal process straight............................................................. 14

- Lower margin of hind pronotal process curved, lateral carinae of metazona also curved............................. 16

14. Width of vertex 1.6 times width of eye; lower carinae of mid femora straight. Distribution: China (Xizang)............................................................................ F. nyalamensis ( Zheng & Lin, 2015) , comb. nov.

- Width of vertex 2.7–3.0 times width of eye; lower carinae of mid femora sinuate.................................. 15

15. Vertex and frontal costa form a rounded angle in profile; anterior margin of pronotum in dorsal view acute angle projecting. Distribution: China (Shaanxi, Gansu and Henan)....................................... F. qinlingensis Zheng, 1982

- Vertex and frontal costa form an acute angle in profile; anterior margin of pronotum in dorsal view obtuse angle projecting. Distribution: China (Hubei)............................................ F. prominemarginus Zhong & Zheng, 2003

16. Fastigium of vertex in dorsal view not surpassing the anterior margin of eyes; width of vertex 1.3–1.8 times width of eye.. 17

- Fastigium of vertex in dorsal view distinctly surpassing the anterior margin of eyes; width of vertex 2.0–3.5 times width of eye................................................................................................ 18

17. Width of vertex 1.8 times width of eye; lateral carinae of prozona parallel. Distribution: Nepal (Seti).... F. seti Ingrisch, 2006

- Width of vertex 1.3–1.6 times width of eye; lateral carinae of prozona constricted backwards. Distribution: China (Jilin) and Japan (Shizuoka)............................................................. F. surugaensis Ishikawa, 2004

18. Anterior margin of pronotum in dorsal view obtuse angle projecting............................................ 19

- Anterior margin of pronotum in dorsal view acute angle projecting............................................. 25

19. Lower carinae of mid femora straight; width of longitudinal furrow of frontal ridge distinctly wider than antennal groove diameter........................................................................................... 20

- Lower carinae of mid femora sinuate; width of longitudinal furrow of frontal ridge equal to antennal groove diameter.... 21

20. Medial carina of vertex straight in lateral view; external lateral carina of metazona curved and polyline. Distribution: China (Zhejiang)............................................................... F. longwangshanensis Zheng, 1998

- Medial carina of vertex distinctly arcuate in lateral view; external lateral carina of metazona curved but not polyline. Distribution: China (Zhejiang).............................................................. F. nanjiensis Zha & Ding, 2021

21. Pronotum coarse, disc with many large wrinkles and notches or dorsum of pronotum behind shoulders with a row of parallel transverse carinae.....................................................................................22

- Dorsum of pronotum behind shoulders smooth, without large wrinkles and notches and parallel transverse carina........ 23

22. Dorsum of pronotum behind shoulders with a row of parallel transverse carinae. Distribution: China (Yunnan)................................................................................... F. wulaoshanensis Zhen et al., 2010

- Dorsum of pronotum with many large wrinkles and notches. Distribution: Nepal (Panchthar).... .. F. martensi Ingrisch, 2001

23. Frontal costa and vertex forming an acute angle and distinctly projected above dorsal margin of the compound eye; antennal grooves inserted below inferior margin of compound eyes. Distribution: China (Sichuan)... F. tangjiaheensis Deng , sp. nov.

- Frontal costa and vertex forming a right angle and rounded shape; antennal grooves inserted between inferior margin of compound eyes.......................................................................................24

24. Frontal costa and vertex forming a rounded shape; anterior margin of vertex arcuate; in profile, median carina of pronotum arch-like and distinct elevated before shoulders; hind pronotal process narrow and its apex narrowly rounded. Distribution: China (Sichuan)............................................................ F. guangyuanensis Deng , sp. nov.

- Frontal costa and vertex forming a right angle; anterior margin of vertex straight; in profile, median carina of pronotum arch-like and distinct elevated in the middle; hind pronotal process broad and its apex broadly arcuate. Distribution: China (Yunnan).. F. yunnanensis Zheng, 1992