THE TRUE BABOONS 131 



shoulders of the males. We have, indeed, in this respect a gradual descending 

 series from the gelada baboon, in which both sexes are maned, through the Arabian 

 baboon, in which only the males are so ornamented, to the chacma, in which both 

 males and females are maneless. In size the cbacma is one of the largest of the 

 group, and it has been compared in this respect, as well as in its bodily strength, 

 with an English mastiff. 



The general color of this animal is grayish black ; but there is often a kind of 

 greenish reflection in the fur when seen in certain lights. The head, as well 

 as the hands and feet, are deep black ; while the small whiskers on the sides of the 

 face, which do not conceal the ears, are grayish. All the hair of the body is com- 



THE CHACMA BABOON. 



( One-eighth natural size. ) 



paratively long and shaggy ; while that on the nape of the neck, more especially in 

 old males, forms a slender crest. The roots of the hairs are dun colored, but their 

 extremities are ringed. The tail differs from that of the Arabian baboon by 

 the absence of any distinct tuft at the end. The muzzle is perhaps even more pro- 

 longed than in the last-named species ; but the nose is similarly extended beyond 

 the upper lip. The naked callosites on the buttocks are smaller than is generally 

 the case among the baboons. The naked part of the face is of a purplish hue, with 

 the exception of a white ring round each eye, and the whole of the upper eyelids, 

 which are likewise white. In the latter point, curiously enough, this species 



