MAMMALS-DEVELOPMENT OF HAIR. 



527 



in the male than in the female, as in the Mycetes caraya and 

 Pithecia satanas (fig. 68). So it is with the whiskers of some 

 species of Macacus," and, as we have seen, with the manes of 

 some species of baboons. But with most kinds of monkeys the 

 various tufts of hair about the face and head are alike in both 

 sexes. 



The males of various members of the ox family (Bovidae), and 

 of certain antelopes, are furnished with a dewlap, or great fold of 

 skin on the neck, which is much less developed in the female. 



Fig-. 



Pithecia satanas, male (from Brelim). 



Now, what must we conclude with respect to such sexual dif- 

 ferences as these? No one will pretend that the beards of cer- 

 tain male goats, or the dewlap of the bull, or the crests of hair 

 along the backs of certain male antelopes, are of any use to them 

 in their ordinary habits. It is possible that the immense beard 

 of the male Pithecia, and the large beard of the male orang, 

 may protect their throats when fighting; for the keepers in the 

 Zoological Gardens inform me that many monkeys attack each 



' Rengger, 'Saugethiere,' &c. s. 14; Desmarest, 'Mammalogie,' p. 66. 



