156 APES AND MONKEYS. 



THE WHITE-THROATED SAPAJOU (Cebus hypoleucus). 



This species, represented in the lower figure of the illustration on p. 150, is an 

 inhabitant of Central America. It belongs to the same group as the preceding one, 

 from which it is distinguished by its coloration. Thus, while the general colour of 

 the fur is black, the forehead and part of the crown of the head, as well as its sides, 

 together with the throat and neck are white ; while the naked portion of the face 

 is of a pale flesh-colour. 



THE SMOOTH-HEADED SAPAJOU (Cebus monachus). 



The smooth-headed, monk, or yellow-headed sapajou, is a species from Rio 

 Janeiro and other places in South-Eastern Brazil, which takes all its three names 

 from the extremely close and short yellow hair with which the front of the head is 

 covered. It is represented in the left-hand upper figure of the illustration on p. 150. 



The fur of this species is very short and stiff. In colour the crown of the 

 head, the whiskers and chin, together with the shoulders, haunches, limbs, and tail 

 are pure black ; the sides and back, more especially in the hinder half of the body, 

 are yellow, more or less mixed with black ; while the sides of the neck, the chest, 

 and the front of the shoulders are yellow ; the forehead and temples being whitish- 

 yellow. Such is the striking coloration of the typical form of this species, but 

 there are several variations therefrom, and the specimen represented in our 

 illustration belongs to an olive-coloured variety, which has been described as a 

 distinct species, under the name of C. olivaceus. 



THE CRESTED SAPAJOU (Cebus robustus). 



The last member of this genus we shall notice is the crested sapajou of Brazil. 

 This species is distinguished from all those previously mentioned by the long 

 hair on the crown of the head forming a single central crest of a more or less 

 conical shape. The general colour of the fur is bright red, with a black spot on 

 the top of the crown, and the limbs and tail blackish. 



THE WOOLLY MONKEYS. 

 Genus Lagothrix. 



The woolly monkeys are best known by Humboldt's lagothrix (Lagothrix 

 humboldti), first discovered by the traveller whose name it bears on the Orinoco, 

 but also common in the upper part of the valley of the Amazon. This species, 

 which is represented in our illustration, is the only one we shall describe, although 

 three or four others are recognised by many zoologists. 



The woolly monkeys take their name from the thick coat of woolly fur which 

 is found beneath the longer hairs. This is one of the points by which they are 



