Chap. XVIII.] 



ORNAMENTAL COLORS. 



279 



black, tinged with blue. In the adult female, however, 

 the nose at certain regular intervals of time becomes 

 tinted with red. 



In all the cases hitherto given the male is more strong- 

 ly or brightly colored than the female, and differs in a 





Fig. 67.— Head of male Mandrill (from Gervais ' Hi6t. Nat des Mammiferes'). 



■ 



greater degree from the young of both sexes. But as a 

 reversed style of coloring is characteristic of the two 

 sexes with some few birds, so with the Rhesus monkey 

 (Macacus rhesus) the female has a large surface of naked 



