312 
SEXUAL SELECTION: MAMMALS. 
Part II. 
are orange-coloured, with the upper partblack, fo rming 
a band which extends backwards to the ears, the latter 
being clothed with whitish hairs. In the Zoological 
Society’s Gardens I have often overheard visitors ad- 
miring the beauty of another monkey, deservedly called 
Cercopithecus Diana (fig. 76) ; the general colour of the 
fur is grey ; the chest and inner surface of the fore-legs 
are white ; a large triangular defined space on the hinder 
part of the back is rich chesnut ; in the male the inner 
sides of the thighs and the abdomen are delicate fawn- 
coloured, and the top of the head is black ; the face and 
ears^are intensely black, finely contrasted with a white 
transverse crest over the eye-brows and with a long 
white peaked beard, of which the basal portion is 
black.^' 
In these and many other monkeys, the beauty and 
singular arrangement of their colours, and still more the 
diversified and elegant arrangement of the crests and 
tufts of hair on their heads, force the conviction on my 
mind that these characters have been acquired through 
sexual selection exclusively as ornaments. 
Summary . — The law of battle for the possession of the 
female appears to prevail throughout the whole great 
class of mammals. Most naturalists will admit that 
the greater size, strength, courage, and pugnacity of the 
male, his special weapons of offence, as well as his 
special means of defence, have all been acquired or 
modified through that form of selection which I have 
I have seen most of the above-named monkeys in the Zoological 
Society’s Gardens. The description of the Semnopithecus nem^us is 
taken from Mr. W. G. Martin’s ‘ Nat. Hist, of Mammalia,’ 1841, p. 460 ; 
see also p. 475, 523. 
