Key to adults of Alocobisium species

1 One pair of eyes present............................................................ A. ocellatum Beier, 1978

- Eyeless............................................................................................ 2

2 Carapace without distinct furrows....................................................................... 3

- Carapace with at least one distinct furrow................................................................. 5

3 Pedipalpal femur length 0.20–0.25 mm; patella less than 2.0 times, and chela less than 3.0 times as long as broad......... 4

- Pedipalpal femur length 0.30 mm; patella 2.1 times and chela 3.0–3.1 times as long as broad......... A. rahmi Beier, 1976

4 Pedipalpal femur 3.0 times and patella 1.7 times as long as broad......................... A. philippinense Beier, 1966

- Pedipalpal femur 2.8 times and patella 1.5 times as long as broad..................... A. solomonense Morikawa, 1963

5 Pedipalpal femur about 3.5–3.6 times as long as broad................................... A. himalaiense Beier, 1976

- Pedipalpal femur about 2.9–3.0 times as long as broad....................................................... 6

6 Smaller species, pedipalpal femur 0.35–0.38 mm long; trichobothrium st nearer to t than to sb ........ A. tibetense sp. nov.

- Larger species, pedipalpal femur 0.23 mm long; trichobothrium st nearer to sb than to t ......... A. malaccense Beier, 1952