Chap. XVIII. 
OENAMENTAL COLOUES. 
293 
yellow beard. Toutes les parties siiperieures de leiirs 
cuisses et le grand espace nu de leurs fesses sont 
egalement colores du rouge le plus vif, avec un 
melange de bleu qui ne manque rfellement pas 
d’elegance.” When the animal is excited all the naked 
parts become much more vividly tinted. Several authors 
have used the strongest expressions in describing these 
resplendent colours^ which they compare with those of 
the most brilliant birds. Another most remarkable 
peculiarity is that when the great canine teeth are fully 
developed, immense protuberances of bone are formed 
on each cheek, which are deeply furrowed longitudinally, 
and the naked skin over them is brilliantly-coloured, as 
just described. (Fig, 67.) In the adult females and in 
the young of both sexes these protuberances are scarcely 
perceptible ; and the naked parts are much less brightly 
coloured, the face being almost 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 
strongly or brightly coloured than the female, and dif- 
fers in a greater degree from the young of both sexes. 
But as a reversed style of colouring is characteristic of 
the two sexes with some few birds, 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 periodically becomes, as I was assured by the 
keepers in the Zoological Gardens, even more vivid, 
and her face is also pale red. On the other hand with 
Gervais, ‘ Hist. XTat. des Mammif eres/ 1854, p. 103. Figures are 
given of the skull of the male. Desmarest, ‘ Mammalogie,’ p. 70. 
Geoffrey St.-Hilaire and F. Cuvier, ‘ Hist. Nat. des Mamm.’ 1824, tom. i. 
