5 3^ The Descent of Man. Pj ai. !i, 



species, as Mr. Blyth informs me, with an exactly similar series 

 of facts, as in the fortax xUcta, namely, in the male periodically 

 changing colour during the breeding-season, in the effects of 

 emasculation on this change, and in the young of both sexes 

 being indistinguishable from each other. In the AntUuiK niyer 

 the male is black, the female, as well as the young of both 

 Bexes, being brown ; in A. sing-sing the male is much brighter 

 coloured than the hornless female, and his chest and belly are 

 blacker; in the male A. caama, the marks and lines which occur 

 on various parts of the body are black, instead of brown as in 

 the female; in the brindled gnu (A. gorgon) " the colours of the 

 " male are nearly the same as those of the female, only deeper 

 " and of a brighter hue." ^ Other analogous cases could be added. 

 The Banteng bull (£cs sondaicus) of the Malayan Archipelngo 

 is almost black, with white legs and buttocks ; the cow is of a 

 bright dun, as are the young males until about the age of three 

 jears, when they rapidly change colour. Tbe emasculated bull 

 reverts to the colour of the female. The female Kemas goat is 

 paler, and both it and the female Ca/ira agngrus are said to be 

 more uniformly tinted tliim their males. Deer rarely present 

 any sexual differences in colour. Judge Caton, however, 

 informs me that in the males of the wapiti deer (Ceroim 

 canaileiisix) the neck, belly, and legs are much darker than in 

 the female ; but during the winter the darker tints gradually 

 fade away and disappear. I may here mention that Judge 

 Caton has in his park three races of the Virginian doer, which 

 differ slightly in colour, but the differences are almost ex- 

 clusively confined to the blue winter or breeding coat; so that 

 this 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 breeding plumage" Tlie 

 tOLuales of Cerous p dudosas 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 are characteristic of 

 the adult males.^' Lastly, as I am informed by Mr. Blyth, the 



^^ On the Aid. niger, see * Proc. ^' ' Ottawa Academv of Sciences, 



Zool. Soc' 1850, p. 1H3. With re- M;iy, 21, 1868, pp. 3, 5. 

 •ipect to an allied sjiecies, in whicti "^ S. Miiller, on the Bantp'ig, 



there is an equal se.sunl diflereiice 'Zoog. Indischen Archipel,' 1839- 



in colour, see Sir S. Baker, 'The 1844, tab. 35; see also Raffles, as 



Albert iN'yanza,' 1866, vol. ii. p. quoted by Mr. Blyth, in ' Laud and 



327. For the A. sing-sing, Gray, Water,' 1867, p. 476. On goats, 



'Oat. B M us.' p. 100. Desmarest, Dr. (nay, 'Cat. 15rit, Mns.' p. 146; 



' Mammalogie,' p. 468. on the A. [tpsniare^t, ' iMamTnaloi;ie,' p. 48"2. 



fUfUiut Aiidiew Siiiitii, ■ /ouloy y On tlie Ccrias puiudu^us, litf igger. 



its. Africa,' on tlie Gun. ibid. o. 34-5. 



