This species has a restricted distribution in western Cameroon, eastern Nigeria, and on Bioko Island. It is most abundant in montane and sub-montane forest up to at least 2,500 m asl. Its range includes isolated patches of forest in the grasslands of the Cameroon Highlands.

This species is divided into two subspecies: C. preussi preussi, on the mainland, and C. p. insularis, which is restricted to Bioko Island.