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THE DESCENT OF MAN 



gray, witli a square patch on tte loins, the tail and the fore 

 arms being of a pure white; a gorget of chestnut surmounts 

 the chest; the thighs are black, with the legs chestnut red. 

 1 will mention only two other monkeys for their beauty; 

 and 1 have selected these as presenting slight sexual differ- 

 ences in color, which renders it in some degree probable that 



Fia. 78.— Cercopithecus diana (from Brehm). 



both sexes owe their elegant appearance to sexual selection. 

 In the mustaphe-monkey {Cercopithecus cephus) the general 

 color of the fur is mottled greenish with the throat white; 

 in the male the end of the tail is chestnut, but the face is 

 the most ornamented part, the skin being chiefly bluish 

 gray, shading into a blackish tint beneath the eyes, with 



