Key to Japanese species of the genus Caenocryptoides

(Male of Ca. nigrifacies is unknown)

1. Hind femur nearly entirely black. Yellow area of face and frons of male separated by black area.

Propodeum without conspicuous yellow marking(s), at most tinged with reddish brown in some males. Hind coxa without a yellow marking (but some males with reddish brown spot). Face of female more or less matt. Posterior margin of some (100% in T I and T II but variously reduced in other tergites) metasomal tergites with white band. .............................. Ca. tarsalis (Matsumura, 1912)

-. Hind femur reddish brown with a black apical part (Fig. 6A). Yellow area of face and frons of male united into a single area (Fig. 6C). Propodeum sometimes with yellow marking(s) (Figs 6A, B). Hind coxa sometimes with a yellow marking (Figs 6A, B). Face of female more or less polished. Posterior margin of all metasomal tergites with yellow band (sometimes partly reduced) (Figs 6A, B)..........................................................................2

2. Propodeum with yellow marking(s) (Figs 6A, B). Hind coxa with a yellow marking (Figs 6A, B). Relatively large species, body length more than 15 mm. ....................................... Ca. convergens Momoi, 1966

-. Propodeum and hind coxa without a yellow marking. Relatively small species, body length 12 mm. .................................... Ca. nigrifacies Jonathan, 1999