Subspecies and Distribution. C.e.erythrotisWaterhouse,1838—mountainousareasinC&SBiokoI(EquatorialGuinea). C. e. camerunensis Hayman, 1940 — SE Nigeria (E of lower Cross River) and NW Cameroon (N of lower Sanaga River), also in a small areajust S of the Sanaga River, near its mouth, between Tinaso and Lake Tisongo. in Cercopithecidae

Subspecies and Distribution. C.e.erythrotisWaterhouse,1838—mountainousareasinC&SBiokoI(EquatorialGuinea). C. e. camerunensis Hayman, 1940 — SE Nigeria (E of lower Cross River) and NW Cameroon (N of lower Sanaga River), also in a small areajust S of the Sanaga River, near its mouth, between Tinaso and Lake Tisongo.