Couplet 77
77a: Hind coxa with distinct posterior face (at least medially) set off from ventral surface by carina or flange, posterior face often excavated; ventral surface of hind coxa not continuous with first ventrite; hind femur inserted on posterior face of coxa, held posterior to coxa when retracted; fore coxal cavity open; mid and hind tarsi with equal number of tarsomeres
77b: Hind coxa without distinct posterior face; hind trochanter often inserted on ventral surface or on small medial projection of coxa, never received in coxal excavation and resting ventrad of coxa in retracted position; ventral surface of hind coxa more or less continuous with first ventrite, or, if not, than hind tarsus with 1 fewer tarsomere than mid tarsus; fore coxal cavity open or closed
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