290 
SEXUAL SELECTION': MAMMALS. 
Part IL 
winter or breeding coat ; so that Tthis case may be 
compared with those given in a previous chapter of 
closely-allied or representative species of birds which 
differ from each other only in their nuptial plumage.^'^ 
The females of Cervus paludosus of S. America, as 
well as the young of both sexes, do not possess the 
black stripes on the nose, and the blackish-brown line 
on the breast which characterise the adult males.^^ 
Lastly, the mature male of the beautifully coloured and 
spotted Axis deer is considerably darker, as I am in- 
formed by Mr. Blyth, than the female ; and this hue 
the castrated male never acquires. 
The last Order which we have to consider — for I am 
not aware that sexual differences in colour occur in 
the other mammalian groups — is that of the Primates. 
The male of the Lemur macaco is coal-black, whilst 
the female is reddish-yellow, but highly variable in 
colour.^^ Of the Quadrumana of the New World, the 
females and young of Mycetes car ay a are greyish- 
yellow and alike ; in the second year the young male 
becomes reddish-brown, in the third year black, ex- 
cepting the stomach, which, however, becomes quite 
black in the fourth or fifth year. There is also a 
strongly-marked difference in colour between the sexes 
in Mycetes seniculus and Cebus ca^ucinus ; the young 
of the former and I believe of the latter species re- 
sembling the females. With Pifhecia leucoce^hala the 
young likewise resemble the females, which are brownisli- 
‘ Ottawa Academy of Sciences,’ May 21, 1868, p. 3, 5, 
S. Muller, on the Banteng, ‘ Zoog. Indischen Archipel.’ 1839-1844, 
tab. 35 : see also Baffles, as quoted by Mr. Blyth, in ‘Land and Water,’ 
1867, p. 476. On goats. Dr. Gray, ‘ Cat. Brit. Mus.’ p. 146 ; Desmarest, 
‘ Mammalogie,’ p. 482. On the Cervus paludosus, Kengger, ibid. s. 345. 
Sclater, ‘ Proc. Zool. Soc.’ 1866, p. 1. The same fact has also beem 
fully ascertained by MM. Pollen and van Dam. 
