Nasalis concolor (Miller, 1903) . Smithson. Mise. Coll., 45:67.

TYPE LOCALITY: Indonesia, W Sumatra, S Pagai Isl .

DISTRIBUTION: Mentawai Isis (Indonesia).

STATUS: CITES - Appendix I; U.S. ESA and IUCN - Endangered.

SYNONYMS: siberu .

COMMENTS: Type species of Simias Miller, 1903, which was considered a subgenus by Delson (1975:217).