CERCOCEBUS 2S9 



French Congo, and in the last named territory, at the junction of the 

 Oubangui and Congo rivers, C. agilis is found. In Sierra Leone and 

 Liberia, C. ^thiops is met with ; and lastly on the Gold Coast, range 

 unknown, C. lunulatus was obtained. It will be seen from the above, 

 that the habitats of some of the species are either guessed at or 

 unknown, and much remains to be learned of the dispersion of the 

 members of this genus. 



KEY TO THE SPECIES. 



\ 



A. No crest on head. 



a. Color of hairs on body uniform. 



a.' Top of head reddish chestnut C. torquatus. 



b.' Top of head speckled yellow and blackish 



brown C. athiops. 



c! Top of head with a white patch C. lunulatus. 



b. Color on head, limbs and fore part of body 



speckled. 



0.' No brow fringe C. chrysogaster. 



b.' With brow fringe. 



a." Hairs on sides of head not falling over 

 ears. 

 a"' With yellow on flanks and under 



parts C. agilis. 



b."' No yellow on flanks and under 



parts C. hagenbecki. 



b." Hairs on sides of head falling over 



ears C. galeritus. 



B. Crest, or tuft on head, 

 o. Face black. 



a.' Whiskers short, superciliary fringe present. 



a." Gray tinge on mantle C. albigena. 



b." No gray tinge on mantle C. a. johnstoni. 



c." Mantle light brownish gray C. a. zenkeri. 



b.' Whiskers long ; no superciliary fringe C. aterrimus. 



Subgenus Cercocebus. 



No crest ; hairs short ; zygomatic arch high above alveolar border 

 of molars. 



