Key to the genera of Calohypsibiidae

1. Claws present on all pairs of legs. Buccal tube with or without ventral lamina.......................................................... 2

- Claws absent on the fourth pair of legs. Buccal tube with ventral lamina ................................................................... 4

2. Secondary branches of the claws reduced to a small spur or absent (Fig. 7 C,D). Buccal tube with ventral lamina...... ......................................................................................................................................................... Haplomacrobiotus

- Secondary branches of the claws not so reduced, or reduced only on the hind legs. Buccal tube with or without ven- tral lamina ..................................................................................................................................................................... 3

3. Buccal tube without ventral lamina (Fig. 8 B,C,D). Normally developed secondary branches of the claws (Fig. 7 A).. ................................................................................................................................................................. Calohypsibius

- Buccal tube with ventral lamina (Fig. 8 A). Hind legs with two claws or only one claw. The secondary branches may be normally developed or reduced, particularly on the hind legs, as in Fig. 7 B................................. Parhexapodibius

4. Secondary branches of the claws present (Fig. 7 B) ................................................................................ Hexapodibius

- The claws are simple claws (Fig. 7 D)............................................................................................. Haplohexapodibius