Key to genera of Cryptognathini

1. Prosternum strongly produced anteriorly, concealing mouthparts in repose (Fig. 117, 120).. 2

— Prosternum not strongly produced anteriorly, not concealing mouthparts in repose (Fig. 123, 126)...................................................................... 3

2. Antenna with 8 articles; anterior clypeal margin truncate or arcuate (Fig. 118); elytral epipleuron weakly descending externally (Fig. 119), often horizontal; lateral prosternal carina long, extended from apex of prosternal process to lateral margin of prosternum........................................................................ Calloeneis Grote

— Antenna usually with 10, sometimes 9 articles; anterior clypeal margin truncate or nearly so, anterior angle usually abrupt, curved upward (Fig. 115, 117); elytral epipleuron strongly descending externally (Fig. 116); lateral prosternal carina short, not extended to lateral margin of prosternum................................... Cryptognatha Mulsant

3. Elytral epipleuron strongly descending externally (Fig. 122); eye slightly notched by expanded clypeus (Fig. 121); clypeus recurved (Fig. 123)..................... Pentilia Mulsant

— Elytral epipleuron nearly horizontal, not strongly descending externally (Fig. 125); eye nearly completely divided by expanded clypeus (Fig. 124, 126); clypeus flat, not recurved .............. ................................................................................................................. Curticornis Gordon