Presbytis thomasi (Collett, 1893) . Proc. Zool. Soc. Lond., 1892:613.

TYPE LOCALITY: Indonesia, Sumatra, Aceh, Langkat .

DISTRIBUTION: Sumatra.

COMMENT: Subgenus Presbytis; see Szalay and Delson, 1979:402. Separated from aygula by Medway, 1970:544.

PROTECTED STATUS: CITES - Appendix II as Order Primates .

ISIS NUMBER: 5301406008008016001.