SAPAJOUS. 157 



distinguished froui the sapajous. A more inipoi'tant point of diHerenco is, ho\ve\er, 

 to be found in the naked skin on the under part of tlie end of the tail — a character 

 in -which these monkey's resemble those of the next two genera. The woolly 

 monkeys have, however, the same robust build as the sapajous, and thereby difi'er 

 from the other members of this group of genera. They have well-developed 



nrMBoiDT's wnoLi.T MoxKF.y (J\ nat. size). 



thumbs. The great lengtli of the tail in the wooll}- monkeys, together with its 

 naked tip, render it a prehensile organ of the most perfect tj^je. 



To the Portuguese colonists of Brazil these animals arc known as Macaco Bar- 

 rigudo, frequently abbreviated into Barrigudo ; the full name signifying " big- 

 bellied monkey," and being applied to them in allusion to their bulky build, as 

 contrasted with the slender form of their cousins the spider-monkeys. Tlie ordinary 

 form of Humboldt's lagothri.x has a general blackish-grey colour, with tlie head, 

 chest, under - parts, and tail black. The individual Jiairs are dark grey, with 

 very shoi-t black tips, on those parts of the body which are not black. Younger 



