Chap. XVIIL] ORNAMENTAL COLORS. 275 



In the Indian Black-buck (A. bezoartica), which belongs 

 to another tribe of antelopes, the male is very dark, almost 

 black ; while the hornless female is fawn-colored. We 

 have in this species, as Mr. Blyth informs me, an exactly 

 parallel series of facts as with the Portax picta, namely, iii 

 the male periodically changing color during the breeding- 

 season, in the effects of emasculation on this change, and 

 in the young of both sexes being undistinguishable from 

 each other. In the Antilope nlger the male is black, the 

 female as well as the young being brown ; in A. sing-sing 

 the male is much brighter colored than the hornless female, 

 and his chest and belly are blacker ; in the male A. caa?na y 

 the marks and lines which occur on various parts of the 

 body are black instead of as in the female brown ; in the 

 brindled gnu (A. gorgon) "the colors of the male are 

 nearly the same as those of the female, only deeper and 

 of a brio-liter hue." 26 Other analogous cases could be 

 added. 



The Banteng bull {Bos sondaicus) of the Malayan 

 archipelago 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 years, when they rapidly change 

 color. The emasculated bull reverts to the color of the 

 female. The female Kemas goat is paler, and the female 

 Copra wgagrus is said to be more uniformly tinted than 



also Dr. Gray, ' Gleanings from the Menagerie of Knowsley,' in which 

 there is a splendid drawing of the Oreas Derbianus : see the text on 

 Tragelaphus. For the Cape Eland ( Oreas canna), see Andrew Smith, 

 4 Zoology of South Africa,' pis. 41, 42. There are also many of these 

 antelopes in the Zoological Society's Gardens. 



26 On the Ant. niger, see ' Proc. Zool. Soc.' 1850, p. 133. With re- 

 spect to an allied species, in which there is an equal sexual difference in 

 color, see Sir S. Baker, « The Albert Nyanza,' 1866, vol. ii. p. 327. For 

 the A. sing-sing, Gray, ' Cat. B. Mus.' p. 100. Desmarest, ' Mammalogie,' 

 p. 468, on the A. caama. Andrew Smith, ( Zoology of South Africa,' on 

 the Gnu. 



