14. cEeRcocesvus. 27 
Cercocebus, Geoff. 1812; Gray, List Mamm. B. M.1841. Aithiops, 
Martin, Quad, 1841. 
I. Hair of crown directed backwards. Cercocebus. 
a. Blackish, with dorsal streak and crown-spot white. 1. 
b. Black, rather pale beneath. 2. 
e. Black crown; red collar; throat white. 3. 
II. Hair of head elongated, forming a compressed crest behind. 
Semnocebus. 4. 
* Crown with reflexed hairs not forming a crest. Cercocebus. 
1. Cercocebus ethiops. The White-crowned Mangabey. B.M. 
Blackish grey ; narrow dorsal streak, crown, and feet blacker ; 
spot on back of crown, throat, chest, and beneath and inside of 
limbs whitish. 
Simia zthiops, Linn, Cercocebus ethiops, Gray, List Mamm. B. M. 
7! Is. Geoff. C. Crossii, Clark, MS. 
Hab. Africa, 
2. Cercocebus fuliginosus. Zhe Sooty Mangabey. B.M. 
Fur sooty black; chin and beneath ashy; feet and tail blacker ; 
hair of crown directed backwards. 
Mangabey (sans collier), Buffon, H. N. xiv. t. 32. Simia eethiops, var., 
Schreb, 8. fuliginosa, F. Cuv. Cercopithecus fuliginosus, Kuhl ; 
Geoff. Cercocebus fuliginosus, Gray, List Mamm. B. M. p. 7. 
Axsrno. ‘Simia Atys, Audeb. iv. § 2.t. 8 (Mus. Paris). Cercopithecus 
Atys, Desm. Cercocebus Atys, Geoff. 
Hab, West Africa. Mauritius, introduced and naturalized. 
3. Cercocebus collaris. The White-collared Mangabey. B.M. 
Blackish grey; cheeks, collar, throat, and chest white; crown 
bay. 
Mangabey 4 collier blanc, Buffon, H. N. xiv. t. 33. ? Cercopithecus 
xthiops, Kuhl. ?Simia ethiops, Linn. Cercopithecus zthiopicus, 
F. Cuv. Pithecus zethiops, ‘Blase, Ost. t.10. _Cercocebus collaris, 
Gray, Inst Mamm. B. M. p. 7! Is. Geoff. C. mangabey, Geoff. 
White-eyelid Monkey, Penn. 
Var. Tail-end white. B.M. 
Hab. West Africa. 
** The crown with elongated hairs forming a compressed crest. 
Semnocebus. 
4, Cercocebus albigena. 
Black ; hair of crown elongated, forming a compressed nuchal 
crest; sides of throat greyish. 
