Couplet 81

81a:  Mid coxae distinctly separated; elytra often reticulate (Figure 26-46A), at least feebly costate (ribbed); femur or tibia compressed; pronotum with distinct longitudinal median carina, groove, or cell, occasionally restricted to base of disc

Lycidae   p.422

81b:  Mid coxae contiguous or nearly so; elytra not reticulate; femur and tibia seldom compressed; pronotum rarely with distinct longitudinal median carina, groove, or cell