14. CERCOCEBUS. 27 



Cercooebus, Geoff. 1812 ; Gray, List Mamm. B. M. 1841. ^Etbiops, 

 Martin, Quail. 1841. 



I. Hair of crown directed backwards. Cercocebus. 



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



b. Black, rather pale beneath. 2. 



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



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



Semnoccbus. 4. 



* Crown with rcjlcxed hairs not forming a crest. Cercocebus. 



1. Cercocebus aethiops. The White-crowned Mangabey. B. M. 



Blackish grey ; narrow dorsal streak, crown, and feet blacker ; 

 ispot on back of crown, throat, chest, and beneath and inside of 

 limbs whitish. 



Simia rcthiops, Linn. Cercocebus sethiops, Gray, List Mamm. B. M- 

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



Ilab. Africa. 



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



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

 hair of crown directed backwards. 



Mangabey (sans collier), Buffon, II. N. xiv. t. 32. Simia cethiops, var., 

 Schreb. S. fuliginosa, F. Cuv. Cercopitbecus fuliginosus, Kuhl; 

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



Albino. 'Simia Atys, Audcb. iv. § 2. t. 8 (Mus. Paris). Cercopitbecus 

 Atys, Desm. Cercocebus Atys, Geoff. 



Ilab. West Africa. Mauritius, introduced and naturalized. 



3. Cercocebus coUaris. The White-collared Mangabey. B.M. 



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

 bay. 



Mangabey a collier blanc, Buffon, II. N. xiv. t. 33. P Cercopitbecus 

 setliiops, Kuhl. P Simia sethiops, Linn. Cercopitbecus ajtbiopicus, 

 F. Cuv. Pitbecus aethiops, Blainv. Ost. t. 10. Cercocebus collaris, 

 Gray, List Mamm. B. M. p. 7 ! Is. Geoff. C. mangabey, Geoff. 

 White-eyelid Monkey, Perm. 



Var. Tail-end white. B. M. 



Ilab. West Africa. 



** 77ic 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. 



