288 
sexual selection: mammals. 
Part 
and the black spots on the ears, all much more dis* 
tinet. We have seen that in this species the crests and 
tufts of hair are likewise more developed in the mad 0 
than in the hornless female. The male, as I am 
informed by Mr. Myth, without shedding his had - ’ 
periodically becomes darker during the breeding-sea" 
son. Young males cannot be distinguished from youoS 
females until above twelve months old; and if d' e 
male is emasculated before this period, he never, accord- 
ing to the same authority, changes colour. The import' 
ance of this latter fact, as distinctive of sexual colouring 
becomes obvious, when we hear 24 that neither the red 
summer-coat nor the blue winter-coat of the Virginia 11 
deer is at all affected by emasculation. With most or 
all of the highly-ornamented species of Tragelaphus tb 0 
males are darker than the hornless females, and thm r 
crests of hair are more fully developed. In the mal 0 
of that magnificent antelope, the Derbyan Eland, tb e 
body is redder, the whole neck much blacker, and tb e 
white baud which separates these colours, broaden 
than in the female. In the Cape Eland also, the mad 0 
is slightly darker than the female . 26 
In the Indian Mack-buck (A. Lezoarlica'), which belong’ 
to another tribe of antelopes, the male is very dark, alm°rt 
black; whilst the hornless female is fawn-coloured. ^ 1 
meet in this species, as Mr. Blyth informs me, an exadj) 
similiar scries of facts, as with the Portax jncta, namely b 1 
the male periodically changing colour during the breed 
24 Judge Caton, in ‘ Trans. Oltawa Acad, of Nat. Sciences,’ lSfiS ’ 
p. d- 0 . 
25 Dr- Dray, ‘ Cat. of Mamm. in Brit. Mus.’ part iii. 1852, p. 13 4 ' 1 ^ 
also Dr. Gray, ‘ Gleanings from the Menagerie of Knowsley,' in ^lu^ 
there is a splendid drawing of the Oreas derbianus : see the text u 
Tragelaphus. For the Cape Eland (Orens canna), see Andrew Bui 1 ’ 
‘ Zoology of S. Africa,’ pi. 41 and 42. There are also many of m e 
antelopes in the Zoological Society’s Gardens. 
