14. CERCOCEBUS. 27 



Cercocebus, Geof. 1812 ; Gray, List Mamm. B. M. 1841. ^tliiops, 

 Martin, Quad. 1841. 



I. Hair of crown directed backwards. Cercocebus. 



a. Blackish, with dorsal streak and crown-spot white. 1. 



h. Black, rather pale beneath. 2. 



c. Black crown ; red collar ; throat white. 3. 



II. Hair of head elongated, forming a compressed crest behind. 



Semnocebus. 4. 



Croivn with reflexed hairs not forming a crest. Cercocebus. 



1. Cercocebus aethiops. The White-croivned Mangahey. 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. 



Simla rethiops, Linn. Cercocebus fethiops, Gray, List Mamm. B. M- 

 7 ! Ls. Geoff. C. Crossii, Clark, MS. 

 Hah. Africa. 



2. Cercocebus fuliginosus. The Sooty Mangahey. B. M. 



Fur sooty black ; chin and beneath ashy ; feet and tail blacker ; 

 hair of crown directed backwards. 



Mangahey (sans colUer), Buffoti, H. N. xiv. t. 32. Simla setMops, yar., 

 Schreh. S. fuhginosa, Jl Cuv. Cercopithecus fuliginosus, ^kMj 

 Geoff. Cercocebus fuliginosus, Gray, List Mamm. B. M. p. 7. 



Albino. Simia Atys, Audeh. iv. § 2. t. 8 (Mus. Paris). Cercopithecus 

 Atys, Desm. Cercocebus Atys, Geoff. 



Hah. West ^ifrica. Mamitius, introduced and naturalized. 



3. Cercocebus collaris. The White-collared Mangahey. B.M, 



Blackish grey ; cheeks, collar, throat, and chest white ; crown 

 bay. 



Mangabey a collier blanc, Btiffm, H. N. xiv. t. 33. P Cercopithecus 

 aethiops, Kuhl. ? Smiia a?tbiops, Linn. Cercopithecus a;thiopicus, 

 i-. Cuv Pithecus lethiops, Blainv. Ost. t. 10. Cercocebus collaris, 

 Gray, List Mamm. i?. J/, p. 7! Is. Geof. C. mangabey, Geof. 

 \\ hite-eyehd Monkey, Fenti. <- . ' u/ 



Var. TaU-end white. jj_ jj;^ 



Hah. West Africa. 



The crown tcith elongated hairs forming a compressed crest. 



Senmoct'bus. 



4. Cercocebus albigena. 



Black; hair of crown ' elongated, forming a compressed nuchal 

 crest ; sides of throat greyish . 



