PITHECUS RHESUS, MACACUS RHESUS 



353 



and many other kinds of insects, besides fruits and berries. Tlieir motor 

 mechanism not only adapts them to rapid movements among the branches of 

 the trees, but enables them to travel with great speed over the surface of the 



^ 



Courtesy, American Museum of Natural History 



FIGS. 163 AND 164. HAND AND FOOT OF MACACUS RHESUS. 



Left. Dorsum of hand showing long slender fingers and well-developed finger-nails. 



Right. Dorsum of foot, showing large, opposable great toe, well-marked digitation, pronounced toe-nails 

 and general hand-like characters ol the foot. 



ground. Having no fear of the water, they are able to swim for long distances. 

 As compared with the baboons, they show a greater mental alertness. 



Psychological Studies upon the Pithecus Monkeys 



Not a little exact psychological study has been de\'oted to the several 

 species of pithecus monkeys, particularly concerning their ability to learn, 

 their mentality and their capacity for development of ideation. Kinnaman 

 (1902), in his "Pithecus Rhesus," presents valuable data concerning the 



