Couplet 124

124a:  Head with temples and occipital ridge distinct, occipital ridge closely fitting against pronotum, constricted behind to a distinct neck
(difficult to see when head is retracted with ridge and temples against pronotum); elytra with strong characteristic sutural stria, no other
striae evident; 11 antennomeres, gradual club of 3-4 antennomeres; abdomen with 4 (females) or 5 (males) ventrites (Colon, see couplet 65)

Leiodidae   p. 408

124b:  Head without ridge and constricted neck that fits against pronotum; elytra striate or not, but not as in preceding entry; antenna variable; at least 5 ventrites