Couplet 151

151a:  Either posterior margin of last ventrite crenulate or body distinctly oval, length no more than 2X maximum width; antenna with
8-10 antennomeres; hind trochanter obliquely attached to femur, but distinctly separating coxa from femur

Cerylonidae  p. 433

151b:  Posterior margin of last ventrite never crenulate; body elongate, at least 2.75X maximum width; antenna with 10-11 antennomeres; hind trochanter offset so that femur a d coxa are in contact or nearly so