Key to the Chinese species of Compsidolon Reuter

1 Apex of clavus and corium darkened, forming median fuscous stripe on hemelytra................. C. nebulosum (Reuter)

- Apex of clavus and corium not forming median fuscous stripe on hemelytra....................................... 2

2 Dorsum with dark spots or without spots; hind femora almost completely dark....................... C. kerzhneri Kulik

- Dorsum with clear spots; hind femora pale with dark spots..................................................... 3

3 All tibiae pale at base.................................................................................. 4

- All tibiae darkened at base.............................................................................. 6

4 Frons with reddish brown radial stripes; length of antennal segment II shorter than width of pronotum................................................................................................... C. ailaoshanensis sp. nov.

- Frons without dark radial stripes; length of antennal segment II longer than width of pronotum........................ 5

5 Cuneus (except base) with dark spots........................................................ C. absinthii (Scott)

- Cuneus without dense spots or with hardly visible spots............................. C. salicellum (Herrich-Schaeffer)

6 Smaller species, total length less than 2.80 mm; antennal segment I almost entirely balck............ C. pumilum (Jakovlev)

- Larger species, total length more than 3.10 mm; antennal segment I paler with dark spots or without clear spots........... 7

7 Antennal segments III and IV almost entirely brown; apex of clypeus darkened.................................... 8

- Antennal segments III and IV pale; clypeus almost entirely pale................................................. 9

8 Antennal segment II with a black ring at apex; apex of endosoma Y-shaped (Fig. 36)............. C. furcillatum Li and Liu

- Antennal segment II without a black ring at apex; two apical spines at the endosoma, one slender and straight, the other shorter, unciform (Fig. 60)..................................................................... C. uncum Li and Liu

9 Labium reaching to abdomen; pronotum without dark spots..................................... C. flavidum sp. nov.

- Labium reaching to hind coxae; pronotum with clear dark spots................................................ 10

10 Interocular distance longer than width of eye in male; cuneus with dark spots....................... C. pilosum sp. nov.

- Interocular distance shorter than width of eye in male; cuneus without obvious dark spots............. C. eximium (Reuter) ......continued on the next page