216 THE NATURAL HISTORY or 



yet imperfectly known ; said to inhabit Brasil ; of a 

 grayish ash colour, with reddish head, hands, and tail. 

 The other, discovered by Humboldt and described 

 by him under the name of Caparro, has been dedi- 

 cated by Geoffroy to that naturalist, and will stand 

 in our systems as Lagothrix Humboldtii. It in- 

 habits the banks of the Guaviare, one of the tributaries 

 of the Oronooko, where it was discovered by Hum- 

 boldt and Bonpland, in the hut of an Indian, who 

 had taken it in an excursion to the west. It is an 

 animal of considerable size, being about two feet two 

 inches in length, exclusive of the tail. The head is 

 round, and singularly large. The hair is long, strong, 

 and uniformly of a martin gray ; having the tips 

 black. The face is naked and black, but the mouth 

 is surrounded by long and stiff bristles. The tail, 

 slightly longer than 'the -body, is prehensile, and 

 naked at the extremity. They live in numerous 

 bands, and are frequently seen, says Humboldt, raised 

 upon the hinder extremities. We are not aware of a 

 specimen of this animal in any of the collections in 

 this country. 



We must now describe another form, included in the 

 genus Cebus of Xerleben. The animals contained in 

 this genus, exhibit great activity; are excellent climbers, 

 and in all their members show great adaptation for a sil- 

 van life. The fore hands are very perfectly formed, more 

 so than those of the monkeys of the Old Continent, and 



