Couplet 22

22a:  Eyes not divided by canthus; clypeus with sides narrowing apically; color brown, gray, or black; hind femur and tibia not enlarged, not covering abdomen (Figure 26-29B)

Trogidae   p. 412

22b:  Eyes divided by prominent canthus; clypeus with sides subparallel to divergent anteriorly; color testaceous to light reddish brown; hind femur and tibia enlarged, covering most of abdomen