Cercopithecus erythrotis Waterhouse, 1838 . Proc. Zool. Soc. Lond., 1838:59.

TYPE LOCALITY: Equatorial Guinea, Bioko .

DISTRIBUTION: S and E Nigeria, Cameroon, Bioko.

STATUS: CITES - Appendix II; U.S. ESA - Endangered; IUCN - Vulnerable.

COMMENTS: Considered a subspecies of cephus by Struhsaker (1970:374-376); but also see Dandelot (1974:23). McAllan and Bruce (1989) argued that the original publication of this species should be: The Analyst, 24:298-299 [pubi. 2 July 1838].