11. 0UAKAIUA. 61 



2. Chiropotes Satanas. The Brown Cuxio. B. M. 



Fur ashy brown ; face, crown, the heard, limbs, and tail densely 

 hairy, hairs elongate ; chin-beard moderate. 



Cebus Satanas, Hoffm. Mag. Berl. i. p. 93, 1807. Brachyurus Isiaelita, 

 Spix, Bras. t. 70. Chiropotes couxio, Lesson. 



JIab. Brazil. 



In the Paris Museum, the malo has tho back brown and tho wig 

 black ; the female, back and wig fulvous ; young, nearly uniform 

 brown, and the wig slightly developed. 



3. Chiropotes ater. The Black Cuxio. B. M. 



Fur black, shining ; hairs of eyebrows projecting. Young. Black, 

 with very short pale tips to some of the hairs on the back ; the hair 

 of tho crown radiating from the centre and projecting forwards ; 

 beard rudimentary ; tail slender, as long as the body and head. 



Hab. Brazil? 



4. Chiropotes albinasa. The White-nosed Cuxio. 

 Fur of body and head deep black, pale- washed ; nose white. 

 Pithecia albinasa, I. Geoff. Comp. Bend. 1848 xxviii p. 298 ! ; Arch, 

 dn Mus. x. p. 559 ; Castelnau, JSxpid. Amer. Sud, t. 2. f. 2 (young). 



Uab. Brazil. Mus. Taris ; a single young specimen. 



11. OUAKARIA. 



Fur short, silky. Faco short, subcylindrical. The crown and 

 forehead with short hairs directed forwards. Tho chin scarcely 

 bearded. Legs elongate. Lower jaw dilated behind. The lower 

 cutting-teeth very much shelving. 



Brachyurus, I. Geoff. Brachyurus, sp., Sfrix. Cacajao, Lesson. 

 Ouakaria, Gray, P. Z. S. 1859, p. 10. 

 The converging, slender, shelving lower cutting- teeth, the slender 

 limbs, and short tail show an affinity with Indris (in Lemuridce). 



M. I. Geoffroy describes the tail of Brachyurus calvus and B. rubi- 

 cundus as very short, bushy, about a centimetre long. There are four 

 specimens in the British Museum which agree with the description of 

 B. calvus ; but three of them have the tail about the same length and 

 form as in 0. melanocephala — that is, about one-third the length of 

 the body ; and that of the other is short ; but then it appears to have 

 been cut or broken off. The vertebra of the tail of the small white 

 specimen is 6 inches long, so that the length of the tail iu the 

 stuffed specimen does not depend on the stuffing. i 



