Oil AP. XVII 1. Mammals — Ornamental Colours. 557 



mature male of the beautifully coloured and spotted axis deer is 

 oonsiderably darker than the female ; and this Ijue the castrated 

 male never acquires. 



The last Order which we need consider is that of the Primntus 

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

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

 females and young of Mycetes curaya 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 iifth year. There is 

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

 Mymt'S seniculus and Cehus capucinus ; the young of the former, 

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

 "With Pithecia hucocephala the young likewise resemble the 

 females, which are bi-ownish-black above and light rusty-red 

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

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

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

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

 band over the brows ; the females vai'y from whity-brown to a 

 dark tint mixed with black, but are never wholly black/" In 

 the beautiful Cercupithecus 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 (fiercoftithecus 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 pronoiinced 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 Muller, the 

 male of Scmuopithecus chrysomdas is nearly black, the female 

 being pale brown. In the Cercopithecus cynosurus and grit.eo- 

 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 Cynocephalns 

 hd'oyadi-yas differs from the female not only by his immense 



" Solater, ' Proc. Zool. Soc' 1866, 14 ; and Brehm, ' Illustrirtes Thicr- 



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



fully ascertained by MM. Pollen and Desmarest, ' Mammalogic,' p. 7."), 



van Dam. See. also, Dr. Gray in On Hylobates, BIyth, * Lan.i and 



' Aaunls and Mag. of Nat. Hist.' May Water,' 1867, p. 135. On the Seni. 



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



'" On Myuttea, Uengger, ibid. o. dischen Arohipel.' tab. x. 



