c «ap. XVIII. 
QUADRUMANA, 
311 
in some degree probable that both sexes owe their 
e legant appearance to sexual selection. In the mous- 
tache-monkey ( Cercopithecus cephus) the general colour 
of the fur is mottled-greenish, with the throat white ; in 
the male the end of the tail is chesnut; but the face is 
the most ornamented part, the skin being chiefly bluish- 
grey, shading into a blackish tint beneath the eyes, 
with the upper lip of a delicate blue, clothed on the 
lower edffe with a thin black moustache ; the whiskers 
O 
Cercopithecus Diana (from Brebm). 
rig. 76. 
