Key to species of subgenus Chlaenioctenus Bates, 1892

(Modified from Liu et al. 2010)

1. Femora wholly black (Figs. 10, 12)....................................................................... 2

- Femora more or less yellow in the middle (Figs. 2, 3, 6, 8, 14, 16, 18, 19)......................................... 5

2. Elytron with a yellow spot at posterior third (Figs. 1, 3, 9, 11, 17)............................................... 3

- Elytron with a yellow spot near the middle (Figs. 5, 7, 13, 15, 19)............................................... 4

3. Each of elytral intervals 2−8 glabrous medially, with a row of pubescence laterally (near striae); pronotum glabrous, with coppery metallic shine laterally. China (Hainan) (Figs. 9, 11, 22, 28)........................................ C. li sp. n.

- All elytral intervals regularly pubescent; pronotum pubescent, with green metallic shine laterally. China (Jiangxi, Guangdong)................................................................................... C. freyi Jedlička, 1960

4. Each of elytral intervals 2-8 with a row of regular punctures laterally (near striae); pronotum finely punctate. Myanmar ...................................................................................... C. pectinipes Bates, 1892

- Each of elytral intervals 2-8 with irregular punctures laterally (near striae), not displayed in a row; pronotum coarsely punctate. Thailand (Chiang Mai)........................................................... C. bilyi Kirschenhofer, 2009

5. Elytron with a yellow spot in or slightly behind the middle.....................................................6

- Elytron with a yellow spot at posterior third................................................................ 10

6. Elytral intervals regularly pubescent. China (Yunnan)......................... C. rotundithorax Liu & Kavanaugh, 2010

- Elytral intervals pubescent laterally, glabrous medially........................................................ 7

7. Elytron with a yellow spot in the middle; antennomeres 1−3 brown (Figs. 5−8). India (Darjeeling).... C. bodhidharma sp. n.

- Elytron with a yellow spot slightly behind the middle (Figs. 13, 15, 19); antennomeres 1−3 totally or partly black......... 8

8. Lateral margin of pronotum sinuate before posterior angle (Fig. 24)............................. C. eneides Bates, 1892

- Lateral margin of pronotum straight before posterior angle (Fig. 25)............................................. 9

9. Antennomere 1 yellow or light brown, genae strongly tumid, as long as half of eye in dorsal view (Fig. 19) Vietnam (Mau Son)....................................................................... C. langsonensis Kirschenhofer, 2008

10. Antennomere 1 dark brown; genae slightly tumid, as long as one-third of eye in dorsal view. Myanmar (Kachin)................................................................................. C. schillhammeri Kirschenhofer, 2003

11. Genae pubescent. China (Taiwan) ................................................. C. piligenys Liu & Liang, 2010

- Genae glabrous...................................................................................... 11

12. Pronotum coarsely punctate; elytral intervals pubescent laterally, glabrous medially. China (Guangxi)................................................................................................ C. sehnali Kirschenhofer, 2008

- Pronotum finely punctate; elytral intervals regularly pubescent................................................. 12

13. Antennomeres 1−3 yellow; pronotum wider than long (Figs. 1, 3, 20). China (Guangdong)................ C. cheni sp. n.

- Antennomeres 1−3 black or brown; pronotum longer than wide (Figs. 17, 18, 23). Vietnam (Tam Dao)....... C. aodai sp. n.