50 CETHDJK. 



Var. ? or artificially distorted. Hair of crown radiating from a 

 central lino forming an oblong crest. B. M. 



C. cristatus, Gray, 3IS. 



Ilab. Brazil. 



7. Cebus xanthocephalus. The Monk Cebus. B. M. 



Fur short, stiff, black- and yellow-varied; crown, temples, whis- 

 kers, chin, shoulders, haunches, arms, legs, and tail black ; back 

 and sides, especially behind, yellow, more or less black-washed ; 

 sides of neck, chest, and front of shoulders yellow. The hair of 

 the crown reflexed, short ; forehead and temples whitish yellow. 



Var. 1. Shoulders and loins pale-yellow; outside of thighs and 

 base of tail reddish. 



Var. 2. Blacker ; forehead whiter. 



Cebus xanthocephalus, Spice, Bras. t. 3 (good). C. monachus, Fischer. 

 C. cucullatus, Spix, Bras. t. 6. 



Ilab. Paraguay ; Bio Janeiro, Spice. 



See Cebus olivaceus, Schrank, Wagner, Schreb. v. t. 8. 



8. Cebus albifrons. The White-fronted Cebus. B. M. 



Pale reddish brown ; back and, especially, the outside of limbs 

 redder ; face, forehead, throat, shoulders, and chest white. Tail with 

 rather long hair ; hair of the crown short. 



C. albifrons, Gray, P. Z. S. 1865 ! not Geoffrey. 



Hob. South America. 



9. Cebus hypoleucus. The White-throated Sapajou. B.M. 



Black ; forehead and front of crown, neck and sides of head, 

 shoulders and chest white ; face pale flesh-coloured. 



Sai a gorge blanche, Buffon, II. N. xv. t. 9 ; Audebert, t. 5 ; F. 

 Cuv. Mamm. Lith. t. Simia hypoleuca, Humboldt, Obs. Zool. p. 337. 

 Cebus hypoleucus, Geoff. Ami. Mus. xix. p. 111. 



Ilab. Central America ;« Guiana ; Caraccas, Salvin. 



■i 



10. Cebus leucocephalus. The White-headed Cebus. B. M. 



Pur dark reddish brown, very obscurely punctulated. Head to 

 the front edge of ears white ; crown with a short narrow central 

 black streak ; feet blackish. 



Cebus leucocephalus, Gray, P. Z. S. 1865, fig. ! 



Ilab. Columbia. 



See Cebus versicolor, Pucheran, Bev. Zool. 1845, p. 335 ; I. Geoff. 

 Cat. p. 47. Without frontal streak, and tail paler, perhaps 

 discoloured. Hub. Columbia. 



