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

TYPE LOCALITY: Indonesia, Sumatra, Aceh, Langkat .

DISTRIBUTION: Sumatra: Aceh, south to about 3°50'N.

STATUS: CITES - Appendix II.

SYNONYMS: nubilus .

COMMENTS: Separated from " aygula " (= cornata) by Medway (1970:544).