Key to genera of Aclopinae of the world

1. Head with two well developed transverse carinae on frons and clypeus (Figs. 33, 35, 38), mesotibia and metatibia with one transverse carinae........................................................................... Desertaclopus

1'. Head lacking two transverse carinae, mesotibia and metatibia with two transverse carinae............................ 2

2. Mandibles with external margin broadly rounded (Figs. 1–4), labrum not reflexed or poorly reflexed............... Aclopus

2'. Mandibles with external margin strongly angled (Figs. 5, 8, 10, 12, 15, 17, 19, 21), if poorly angled, then metatibial spurs apart with notch in middle; labrum strongly reflexed................................................... Gracilaclopus