408 



SYSTEMATIC ZOOLOGY 



two mammae are always thoracic in position. All except man 

 are confined to the warmer countries, and the majority are gre- 

 garious, being either arboreal or terrestrial. The smallest and 

 most lowly developed are the squirrel-like marmosets, which are 

 confined to the northern portion of South America, living more 

 especially in Brazil. The body is from twenty to thirty centi- 

 meters long, and the tail, as long or longer, is never prehensile 



FlG. 391. Ateies, a spider monkey. (From a photograph provided by the American 



Museum of Natural History.) 



as it is in many monkeys. The hair is usually soft and varies 

 much in color and length; it is often yellowish, reddish, or 

 black and with more or less white. The digits are nearly all 

 provided with claws instead of nails. They are chiefly insec- 

 tivorous. 



The remaining Anthropoidea, exclusive of man, are often 

 spoken of as the New World monkeys and the Old World 

 monkeys, the two groups taking their names from their habi- 



