290 SEXUAL selection: mammals. PartIL 



Avinter or breeding coat; so that this case may be 

 corapared 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 fdudosus of S. America, as 

 well as the young of both sexes, do not possess the 

 black stripes on tlie 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 liave to consider — for I am 

 not aware that sexual differences in colour occur in 

 the other mammalinn 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.2^ Qf ^\^Q 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 betw^een the sexes 

 in Mycetes seniculus and Celiis capucinus ; the young 

 of the former and I believe of the latter species re- 

 sembling the females. With Pithecia leucocephala the 

 vouno- likewise resemble the females, which are brownish- 



2' ' Ottawa Academy of Sciences,' May 21, 1868, p. 3, 5. 



28 S. Miiller, on the Banteng, ' Zoog. Indischeu Archipel,' 1839-1844, 

 tab. 35 : see also Eaffles, 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. 



29 Sclater, ' Proc. Zool. Soc' 1866, p. 1. The same fact has also been 

 fnlly ascertained by MM. Pollen and van Bam. 



