OUAKARI MONKEYS 



561 



species B. nibicundus at any rate has an absolutely as well as 

 a relatively greater length of intestines and caecum than any 

 other Anu-rican ]\Ionkey known. 



Not the least remarkable fact about these Ouakari Monkeys is 

 their distribution in Soutli America. We cannot do better than 



Fig. 267. — White-nosed Saki. Pithecia albinasa. x-J. {Fxom Nature.) 



quote the summary given by Messrs. P. L. and W. L. Sclater in 

 their Geograpluj of Mammals, which is as follows: "Each of 

 them, as first shown by Bates and afterwards further explained 

 by Forbes, is limited to a comparatively small tract of forest on 

 the banks of the Amazon and its affluents. The Black-headed 

 Ouakari {B. melanocephahi s) ... is met with only in a tract 

 VOL. X 2 



