Couplet 74

74a:  Abdomen very short, one half length of metasternum; pronotum not margined laterally; scutellum not visible; elytron at base with pit at end of impressed groove; Florida

Jacobsoniidae   p. 424

74b:  Abdomen longer than metasternum; (except Akalyptoischion, California); lateral margin of pronotum absent to finely dentate; scutellum small but visible; elytra usually striate; common and widespread