Chap. XVIII. Mammals — Ornamental Colours. 537 



mature male of the beautifully coloured and spotted axis deer is 

 considerably darker than the female ; and this hue the castrated 

 male never acquires. 



The last Order which we need consider is that of the Primates, 

 The male of the Lemur macaco is generally coal-black, whilst the 

 female is brown. 29 Of the Quadrumana of the New World, the 

 females and young of Mycetes caraya are greyish-yellow and like 

 each other ; in the second year the young male becomes reddish- 

 brown ; in the third, black, excepting the stomach, which, how- 

 ever, becomes quite black in the fourth or fifth year. There is 

 also a strongly-marked difference in colour between the sexes of 

 Mycetes seniculus and Cebus capucinus ; the young of the former, 

 and I believe of the latter species, resembling the females. 

 With Pithecia leucocephala the young likewise resemble the 

 females, which are brownish-black above and light rusty-red 

 beneath, the adult males being black. The ruff of hair round 

 the face of Ateles marginatus is tinted yellow in the male and 

 white in the female. Turning to the Old World, the males of 

 Hylobates hoolock are always black, with the exception of a white 

 band over the brows ; the females vary from whity-brown to a 

 dark tint mixed with black, but are never wholly black. 30 In 

 the beautiful Cercopithecus diana, the head of the adult male is 

 of an intense black, whilst that of the female is dark grey ; in 

 the former the fur between the thighs is of an elegant fawn- 

 colour, in the latter it is paler. In the beautiful and curious 

 moustache monkey {Cercopithecus cephus) the only difference 

 between the sexes is that the tail of the male is chesnut and that 

 of the female grey; but Mr. Bartlett informs me that all the 

 hues becomes more pronounced in the male when adult, whilst 

 in the female they remain as they were during youth.. Ac- 

 cording to the coloured figures given by Solomon Miiller, the 

 male of Semnopnthecus chrysomelas is nearly black, the female 

 being pale brown. In the Cercopithecus cynosurus and griseo- 

 viridis one part of the body, which is confined to the male sex, is 

 of the most brilliant blue or green, and contrasts strikingly 

 with the naked skin on the hinder part of the body, which is 

 vivid red. 



Lastly, in the baboon family, the adult male of Cynocephalus 

 hamadryas differs from the female not only by his immense 



29 Sclater, < Proc. Zool. Soc.' 1866, 14; and Brehm, < Illustrates Thier- 



p. 1. The same fact has also been leben,' B. i. s. 96, 107. On Ateles, 



fully ascertained by MM. Pollen and Desmarest, i Mammalogie,' p. 75. 



ran Dam. See, also, Dr. Gray in On Hylobates, Blyth, ' Land and 



k Annals and Mag. of Nat. Hist.' May Water,' 1867, p. 135. On the Sem. 



1871, p. 340. nopithecus, S. Miiller, 'Zoog. In- 



10 On Mycetes, Rengger, ibid. s. dischen Archipel.' tab. x. 



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