SEXUAL SELECTION 



709 



nary way to these aiiimals. If so, they have probably 

 been gained through sexual selection, though transmitted 

 equally, or almost equally^ to both sexes. With many of 

 the Quadrumana, we have additional evidence of the action 

 of sexual selection in the greater size and strength of the 





mi .^~f* L 



Fjg. 73.— Hjad of Semnopitheous comatttS. FlQ. 74— Head of Cebus capuclnua 



Fia. 73. — Head of Ateles marglnatns. 



■i. . ,1-": ■'{J 

 ■ .V - '• • ■'*"^ 



vik -:■ ..- 



••Nl ». ■ 



Fio. 76.— Head of Cebus rellerosns. 



males, and in the greater development of their canine teeth, 

 in comparison with the females. 



A few instances will suffice of the strange manner in which 

 both sexes of some species are colored, and of the beauty of 

 others. The face of the Cercopithecus petaurista (Fig. 77) is 

 black, the whiskers and beard being white, with a defined, 

 round white spot on the nose, covered with short white hair, 



