Key to the species of Macromotettix Günther, 1939

1. Body slender, hind process of pronotum far surpassing behind apex of hind femur................................... 2

- Body stubby, hind process of pronotum not reaching, reaching or slightly surpassing apex of hind femur................ 5

2. Width of vertex as broad as the width of an eye; lateral keels of prozona constricted backwards; hind wings extending beyond the caudal end of pronotum. Distribution in China (Yunnan)............................. M. longipennis Zheng, 1998

- Width of vertex narrower than the width of an eye; lateral keels of prozona parallel; hind wings not reaching or reaching the caudal end of pronotum................................................................................. 3

3. Upper margin of pronotum straight in profile; lower margins of middle femora slightly undulate; hind wings not reaching the caudal end of pronotum. Distribution in Vietnam (Tonkin)............................. M. tonkinennis Günther, 1939

- Upper margin of pronotum undulate before shoulders in profile; lower margins of middle femora straight; hind wings reaching the caudal end of pronotum.............................................................................. 4

4. Width of vertex distinct narrower than the width of an eye (10:18); antenna inserted below lower margins of eyes; disc of pro- notum smooth. Distribution in Indonesia (Sumatra)............................. M. quadricarinatus (Bolivar, 1898)

- Width of vertex slightly narrower than the width of an eye (15:18); antenna inserted between lower margins of eyes; disc of pronotum with numerous small tubercles. Distribution in China (Taiwan) ................ M. sokutsuensis (Karny, 1915)

5. Frontal costa before eyes not visible......................................................................6

- Frontal costa before eyes visible, vertex and frontal costa forming a round or obtuse shape........................... 10

6. Hind wings strongly reduced and just reaching the base of hind femora........................................... 7

- Hind wings elongated and extending beyond the middle of hind femora........................................... 8

7. Disc of pronotum coarse, with numerous protuberances; disc of pronotum concave between shoulders; lower margins of fore and middle femora slightly undulate. Distribution in China (Sichuan).................... M. sichuanensis Deng sp. nov

- Disc of pronotum smooth; disc of pronotum convex between shoulders; lower margins of fore and middle femora straight. Dis- tribution in China (Guangxi)........................................ M. xinganensis Zheng, Zhang & Dang, 2009

8. Width of vertex narrower than the width of an eye; upper margin of pronotum straight in profile; hind wings reaching the cau-

dal end of pronotum. Distribution in Solomon Islands (Guadalcanal)................... M. solomonennis Günther, 1972 - Width of vertex wider than or equal to the width of an eye; upper margin of pronotum undulate in profile; hind wings not reaching the caudal end of pronotum...................................................................... 9

9. Disc of pronotum smooth; lower margins of middle femora straight. Distribution in Samoan Islands................................................................................................ M. compactus (Chopard, 1929)

- Disc of pronotum coarse; lower margins of middle femora undulate. Distribution in China (Hunan and Guangxi)............................................................................... M. luoxiaoshanensis Zheng & Fu, 2000

10. Width of vertex 1.5–2.0 times the width of an eye........................................................... 11

- Width of vertex slightly wider than or equal to or narrower than the width of an eye................................ 13

11. Lateral keels of prozona parallel; upper margin of pronotum undulate, median carina high and lamellar before shoulders in profile and suddenly depressed behind shoulders; hind wings strongly reduced and just reaching the base of hind femora. Distribution in China (Sichuan)....................................................... M. undulatifemura Deng sp. nov

- Lateral keels of prozona constricted backwards; upper margin of pronotum slightly undulate, median carina low in profile; hind wings elongated and extending beyond the middle of hind femora..........................................12

12. Width of vertex 1.5 times the width of an eye; antenna inserted between lower margins of eyes; with abbreviated carinae between shoulders. Distribution in China (Yunnan and Guangxi)......................... M. torulosinota Zheng, 1998

- Width of vertex 2.0 times the width of an eye; antenna inserted below lower margins of eyes; without abbreviated carinae between shoulders. Distribution in China (Shaanxi)........................... M. qinlingensis Zheng, Wei & Li, 2009

13. Vertex and frontal costa forming an obtused angular in profile................................................. 14

- Vertex and frontal costa forming a round shape in profile..................................................... 24

14. Hind process of pronotum not reaching apex of hind femur.................................................... 15

- Hind process of pronotum reaching or slightly surpassing apex of hind femur.....................................21

15. Lateral keels of prozona parallel......................................................................... 16

- Lateral keels of prozona constricted backwards.............................................................19

16. Disc of pronotum smooth; hind wings extending beyond the caudal end of pronotum; hind tibia black. Distribution in China (Guangxi)............................................................ M. yaoshanensis Zheng & Jiang, 2000

- Disc of pronotum coarse, with numerous protuberances; hind wings not reaching the caudal end of pronotum; hind tibia not black.............................................................................................. 17

17. Width of vertex wider than the width of an eye; with abbreviated carinae between shoulders. Distribution in China (Guangxi)................................................................................... M. zhengi Deng, 2016

- Width of vertex equal to or narrower than the width of an eye; without abbreviated carinae between shoulders........... 18

18. Width of vertex 1.1 times the width of an eye; upper margin of pronotum undulate in profile; lower margins of middle femora straight. Distribution in China (Guangxi)..................................... M. tianlinensis Liang & Jiang, 2004

- Width of vertex 0.7 times the width of an eye; upper margin of pronotum convex before shoulders in profile; lower margins of middle femora slightly undulate. Distribution in China (Guizhou and chongqing)............. M. brachyptera Deng, 2016

19. Disc of pronotum smooth; width of middle femora wider than the width of visible part of tegmina. Distribution in China (Yunnan).............................................................. M. wangxiangtaiensis Zheng & Ou, 2010

- Disc of pronotum coarse, with numerous protuberances; width of middle femora narrower than or equal to the width of visible part of tegmina...................................................................................... 20

20. Head not exerted above upper level of pronotum; width of middle femora narrower than the width of visible part of tegmina. Distribution in China (Hunan)................................................... M. nigritibis Zheng & Fu, 2005

- Head exerted above upper level of pronotum; width of middle femora equal to the width of visible part of tegmina. Distribution in China (Guangxi).................................................... M. convexa Deng, Zheng & Zhan, 2010

21. Lateral keels of prozona constricted backwards............................................................. 22

- Lateral keels of prozona parallel......................................................................... 23

22. In profile, frontal costa without concave between lateral ocelli; upper margin of pronotum slightly convex before shoulders and straight behind shoulders in profile; lower margins of middle femora undulate. Distribution in China (Guangxi)................................................................................. M. longtanensis Zheng & Jiang, 2003

- In profile, frontal costa distinctly concave between lateral ocelli; upper margin of pronotum undulate in profile; lower margins of middle femora straight. Distribution in China (Guangxi).................. M. guangxiensis Deng, Zheng & Wei, 2007

23. Width of vertex narrower than the width of an eye; with abbreviated carinae between shoulders of pronotum; mid keel of dorsal side of hind femur serrated, with large teeth. Distribution in China (Yunnan)...... M. wuliangshana Zheng & Ou, 2003

- Width of vertex 1.3 times the width of an eye; without abbreviated carinae between shoulders of pronotum; mid keel of dorsal side of hind femur smooth. Distribution in China (Guangxi)............................ M. nigritubercle Zheng, 2006

24. Hind wings not reaching the caudal end of pronotum, and reaching five sixths of lower margin of pronotum; mid keel of dorsal side of hind femur smooth; hind femur brown. Distribution in China (Yunnan).............. M. brachynota Zheng, 1998

- Hind wings reaching the caudal end of pronotum; mid keel of dorsal side of hind femur serrated; lower side of outer part of hind femur black. Distribution in China (Guangxi)........................... M. serrifemoralis Zheng & Jiang, 2002