Key to the species of Sinochlora (males)

1. Tenth abdominal tergum conspicuously protruding caudad, central process distinct, lateral processes present or absent...... 2

- Tenth abdominal tergum slightly protruding caudad, lateral processes present only, without central process.............. 11

2. Lateral processes of tenth abdominal tergum distinct.......................................................... 3

- Lateral processes of tenth abdominal tergum absent........................................................... 9

3. Subgenital plate with apical part split deeply, apical lobes longer than half the plate itself............................. 4

- Subgenital plate with apical part split shallowly, apical lobes shorter than half the plate itself.......................... 6

4. Epiproct with a stout apical spine on dorsal margin (Fig. 31)................................... S. cucullata sp. nov.

- Epiproct without any spines on dorsal margin............................................................... 5

5. Epiproct small, with 2 apical projections: the thin one on dorsal margin, and the robust, upcurved, stem-shaped projection orig- inated on ventral surface, densely covered with bristles at apical area (Figs. 29, 53)................. S. longipenis sp. nov.

- Epiproct stout and thickened, with apex tapering......................................... S. voluptaria (Carl, 1914)

6. Epiproct with 1 or 2 apical spines on dorsal margin........................................................... 7

- Epiproct without any spines on dorsal margin............................................................... 8

7. Epiproct small rounded-triangular, with an apical spine (Figs. 25, 50).............................. S. apicalis sp. nov.

- Epiproct approximately trapeziform, with 2 apico-lateral spines................ S. longifissa (Matsumura & Shiraki, 1908)

8. Central process of tenth abdominal tergum narrow and long; epiproct approximately triangular.................................................................................................... S. nonspinosa Liu & Kang, 2007

- Central process of tenth abdominal tergum broad and short; epiproct approximately trapeziform.................................................................................................... S. tibetensis Liu & Kang, 2007

9. Epiproct with 2 apical spines on dorsal margin............................................................. 10

- Epiproct with an apical spine on dorsal margin....................................... S. stylosa Shi & Chang, 2004

10. Epiproct approximately trapeziform, with a pair of stout apico-lateral spines.............. S. trapezialis Liu & Kang, 2007

- Epiproct approximately triangular, terminal narrow, with a pair of small teeth (Fig. 61).......... S. sinensis Tinkham, 1945

11. Epiproct with 3 apical spines on dorsal margin............................................................. 12

- Epiproct with 2 apical spines on dorsal margin............................................................. 14

12. Central spine strongly recurved, much longer than lateral ones on epiproct (Fig. 48)........ S. trispinosa Shi & Chang, 2004

- Central spine not longer than lateral ones on epiproct........................................................ 13

13. Notch between lateral processes slightly narrow; lateral spines as long as central one on epiproct (Fig. 58)............................................................................................. S. aequalis Liu & Kang, 2007

- Notch between lateral processes broad; lateral spines slightly longer than central one on epiproct................................................................................................. S. mesominora Liu & Kang, 2007

14. Epiproct symmetrical, equilaterally triangular in the whole view, with black bristles on ventral surface.............................................................................................. S. szechwanensis Tinkham, 1945

- Epiproct not as above, without bristles on ventral surface..................................................... 15

15. Subgenital plate upcurved gently; tenth abdominal tergum with an angular apical notch, epiproct longer than wide....................................................................................... S. hainanensis Tinkham, 1945

- Subgenital plate upcurved strongly; tenth abdominal tergum with a semicircular apical notch, epiproct wider than long....................................................................................... S. semicircula Liu, 2011