Key to species of genus Coeloides Wesmael in China

1. Second metasomal tergite without lateral longitudinal grooves (Fig. 24); mesosoma black, and metasoma reddish­yellow (China: Liaoning) ............................................. .......................................................... Coeloides glaboventris Wang et Chen, sp. nov.

­ Second metasomal tergite with lateral grooves (Figs. 3, 5, 9, 15, 20, 30, 37); mesosoma reddish­yellow or brown, metasoma reddish­brown or brown ............................. 2

2. Apex of second flagellomere with strongly developed ventro­lateral flares (Figs. 2, 10,

31, 36) ........................................................................................................................... 3 ­ Apex of second flagellomere with weakly developed ventro­lateral flares (Figs. 16, 19, 34) ................................................................................................................................. 6

3. First metasomal tergite with narrow, smooth and shallow grooves postero­laterally (Figs. 9, 30) ................................................................................................................... 4

­ First metasomal tergite with wide, crenulate and deep grooves postero­laterally ......... ....................................................................................................................(Figs. 3, 37)5

4. Mesosoma and metasoma yellowish­brown; second metasomal tergite smooth medially, with raised lateral areas (Fig. 30) (China: Zhejiang)............................................... ............................................................ Coeloides longquanus Wang et Chen, sp. nov.

­ Mesosoma and metasoma yellowish; second metasomal tergite striolate medially, without raised lateral areas (Fig. 9) (China: Jilin)........................................................... ........................................................ Coeloides changbaiensis Wang et Chen, sp. nov.

5. Head black; mesosoma reddish­brown; metasoma dark yellow; first metasomal tergite strongly widened apically (Fig. 3) (China: Heilongjiang and Shaanxi; Europe) ............. ............................................................................... Coeloides abdominalis (Zetterstedt)

­ Head yellowish brown or dark brown; mesosoma partly reddish yellow but largely brown; metasoma largely brown; first metasomal tergite weakly widened apically (Fig. 37)........................................................................ Coeloides ungularis Thomson

6. Second metasomal tergite with wide and deep longitudinal lateral grooves which do not extend to the suture between second and third metasomal tergites (Figs. 5, 20).. 10

­ Second metasomal tergite with relatively narrow and shallow longitudinal lateral grooves which extend to the suture between second and third metasomal tergites (Fig. 37) ................................................................................................................................. 7

7. Vein cu­a of fore wing distinctly postfurcal (Fig. 17); head, mesosoma and metasoma reddish­yellow (China: Heilongjiang)......... Coeloides flavus Wang et Chen, sp. nov.

­ Vein cu­a of fore wing interstitial (Figs. 35, 38); head, mesosoma and metasoma reddish brown..................................................................................................................... 8

8. Apex of third flagellomere with strong ventro­lateral flares; vertex reddish­yellow ...................................................................................... Coeloides hummeli Fahringer

­ Apex of third flagellomere without or with weak ventro­lateral flares; vertex black or yellowish­brown............................................................................................................ 9

9. Second flagellomere strongly flared ventro­apically (Fig. 36); vertex and stemmaticum with yellowish­brown spots (China: Heilongjiang and Shaanxi; Europe).............. ...................................................................................... Coeloides ungularis Thomson

­ Second flagellomere weakly flared ventro­apically (Fig. 34); vertex and stemmaticum with blackish spots (Fig. 33) (China: Shaanxi). Coeloides qinlingensis Dang & Yang

10. Vertex black, temple, gena and face yellow, mesosoma black; antennae with 30–38 segments; second flagellomere flared apico­laterally, and third flagellomere hardly so; second metasomal tergite with raised area medio­basally (Fig. 5) (China:

Heilongjiang; Europe) ............................................... Coeloides bostrichorum Giraud ­ Head entirely and the most of mesosoma reddish­ brown; antennae with 47–50 segments; second and third flagellomere flared apico­laterally (Fig. 19); second metasomal tergite without mid­basal raised area medio­basally (Fig. 20) (China: Guizhou).... ........................................................................................ Coeloides guizhouensis Ya n g