Callicebus dubius Hershkovitz, 1988 . Proc. Acad. Nat. Sci. Philadelphia, 140:264.

TYPE LOCALITY: Brazil, probably lower Rio Purus, opposite Lago di Aiapuâ .

DISTRIBUTION: Brazil, between Rio Madeira and Rio Purûs.

STATUS: CITES - Appendix II.

COMMENTS: Perhaps a synonym of cupreus, see Groves (1992).