Key to the species of Sarax species from Borneo

1. Anterior margin of carapace rounded; median eye tubercle well-developed or reduced in size; pedipalpal patella with 4 spines, P1 the longest, and subsequent spines decreasing in size from distal to proximal; pedipalpal tarsus with 2 or 3 spines; tibia of leg IV with 17 or 19 trichobothria ..................................................................................... 2

- Anterior margin of carapace slightly rounded, nearly straight (Fig. 1); median eye tubercle reduced in size; pedipalpal patella with 3 spines, about equal in size (Fig. 4); pedipalpal tarsus with 3 spines (Fig. 5); tibia of leg IV with 19 trichobothria (Fig. 6) ........................................................................................................... Sarax cavernicola sp. nov.

2. Pedipalpal patella with 4 major spines on antero-dorsal and 4 or 3 major spines on pedipalpal femur; pedipalpal tarsus with 2 or 3 spines; tibia leg IV with 19 trichobothria ............................................................................................. 3

- Pedipalpal patella with 4 major spines on antero-dorsal and 3 major spines on pedipalpal femur (Fig. 16); pedipalpal tarsus with 2 minute spines (Fig. 18); tibia of leg IV with 17 trichobothria (Fig. 20).................................................... ................................................................................................................................ Sarax sarawakensis (Thorell 1888)

3. Pedipalpal tarsus with 2 spines; trichobothrium bt on the middle or close to distal fourth basitibial segmenttrichobothrium bc closer to bf than to sbf or about midway between bf and sbf; with or without sexual dimorphism ............. 4

- Pedipalpal tarsus with 3 spines (Figs. 11, 13); trichobothrium bt close to distal fourth basitibial segment, trichobothrium bc about midway between bf and sbf (Fig. 12); with distinct sexual dimorphism ............ Sarax yayukae sp. nov.

4. With distinct sexual dimorphism; median eye tubercle completely divided into two parts (Fig. 26); trichobothrium bt close to proximal fourth basitibial segment, trichobothrium bc about midway between bf and sbf (Fig. 29)................ .................................................................................................................................................... Sarax mardua sp. nov.

- Without sexual dimorphism; median eye tubercle high, black and well-developed, not divided into two parts (Fig. 21); trichobothrium bt on the middle of fourth basitibial segment; trichobothrium bc closer to bf than to sbf (Fig. 25) ................................................................................................................................... Sarax sangkulirangensis sp. nov.