14 ZOOLOGY OF THE VOYAGE OF THE SULPHUR. 



Autlebert, the P. ruftventer and P. rvfibarbata of Kulil, and the P. capillamentosa 

 of Spix, (Sim. Braz. t. 11,) in the general colour of the fur, and in the greater 

 quantity of rufous hairs on the circumference of the chest, than in the other 

 species; yet neither their descriptions nor figures agree with the colouring of the 

 face of our specimens, which are all very similar to one another, and offer scarcely 

 any variation. 



The Yarke. — Pithecia irrorata. 



Plate III. 



Pithecia irrorata, Gray, Ann. and Blag. Nat. Hist. 1S42, 256. 



The head naked, with only a few very short scattered white hairs, which arc rather longer on the 

 front of the ears. Hair of the body very long uniform rigid deep black, with rather long 

 white tips ; of the sides of the chest reddish white ; of the hands short and white. 



Inhab. Tropical America. 



The hair rigid, very dense, very long, and curved, the white tips forming 

 a white edge to the face ; of the limbs shorter, with shorter tips and less 

 curved. 



The head furnishes the most peculiar character of the species ; it is nearly 

 bald, and probably flesh-coloured when alive, and only covered with a few 

 scattered very short white hairs, which are rather more abundant on the cheeks, 

 under the eyes and round the mouth, and rather longer and closer just in front of 

 the ears, so as to form very slight whiskers. 



Spix's figures of his Pithecia hirsuta agree with this animal in many 

 respects ; but he describes that species as having short bristle-like yellowish 

 whiskers, from under the eyes to the angle of the mouth, which at once shows 

 that it cannot have been intended for this species, and certainly does not agree 

 with the descriptions of any of the species which have fallen under the observa- 

 tions of either Geoffroy or Kuhl, or with any of the figures which I am acquainted 

 with. 



