108 



ON THE UAKARI MONKEYS. 



P. Z. S. 1880, 

 p. 630. 



p. 629. 



Hand of Red Uakari. Palmar aspect ; natural size. 



P. Z.j3.^1880, gradually passing into the red of the sides of the head. This reddish 

 tinge is produced by the presence on these hairs of a rufous zone between 

 the white of their bases and the black of the tips ; a few, however, are 

 black throughout. These short hairs almost entirely disappear a little 

 behind the superciliary hairs. The hairy covering of the scalp ceases 

 along a line between the top of the ears and the top of the orbits. 

 Below this limit the sides of the head are only very sparsely covered 

 with rather long, fine, forwardly-directed hairs, which are mostly rufous, 

 paler at the base, and black-tipped ; here, as elsewhere, however, some 

 are quite black. The skin round the angles of the mouth is, for a small 

 area, almost completely naked. The posterior border of the lower jaw, 

 on the contrary, as well as the sides of the throat, are covered by long 



