THE DESCENT OF MAN 



young of both sexes. But as with some few birds it is 

 the female which is brighter colored than the male, so with 

 the Ehesus monkey {Macacus rhesus) the female has a large 

 surface of naked skin round the tail, of a brilliant carmine 

 red, which, as I was assured by the keepers in the Zoologi- 

 cal Gardens, periodically becomes even yet more vivid, and 



Fio. 69.— Head of male Mandrill (from Oerrais, "Hist. Nat. des MammifSres"), 



her face also is pale red. On the other hand, in the adult 

 male and in the young of both sexes (as I saw in the Gar- 

 dens), neither the naked skin at the posterior end of the 

 body, nor the face, shows a trace of red. It appears, how- 

 ever, from some published accounts, that the male does 

 occasionally, or during certain seasons, exhibit some traces 

 of the red. Although he is thus less ornamented than the 



