Chap. XVIII.] EQUAL TRANSMISSION. 287 



as they have almost certainly been intensified through 

 sexual selection, it is probable that they were originally 

 gained through this same process, and then partially 

 transferred to the females. If this view be admitted, 

 there can be little doubt that the equally singular colors 

 and marks of many other antelopes, though common to 

 both sexes, have been gained and transmitted in a like 

 manner. Both sexes, for instance, of the Koodoo {Strep- 

 siceros Kudu, Fig. 82) have narrow white vertical lines on 

 their hinder flanks, and an elegant angular white mark on 

 their foreheads. Both sexes in the genus Damalis are very 

 oddly colored ; in D. pygarga the back and neck are pur- 

 plish-red, shading on the flanks into black, and abruptly 

 separated from the white belly and a large white space on 

 the buttocks ; the head is still more oddly colored, a large 

 oblong white mask, narrowly edged with black, covers the 

 face up to the eyes (Fig. 69) ; there are three white stripes 

 on the forehead, and the ears are marked with white. 

 The fawns of this species are of a uniform pale yellowish- 

 brown. In Damalis albifrons the coloring of the head 

 differs from that in the last species in a single white stripe 

 replacing the three stripes, and in the ears being almost 

 wholly white. 37 After having studied to the best of my 

 ability the sexual differences of animals belonging to all 

 classes, I cannot avoid the conclusion that the curiously- 

 arranged colors of many antelopes, though common to 

 both sexes, are the result of sexual selection primarily ap- 

 plied to the male. 



The same conclusion may perhaps be extended to the 

 tiger, one of the most beautiful animals in the world, the 

 sexes of which cannot be distinguished by color, even by 

 the dealers in wild beasts. Mr. Wallace believes 38 that 



37 See the fine plates in A. Smith's ' Zoology of South Africa,' and Dr 

 Gray's ( Gleanings from the Menagerie of Knowsley.' 

 88 ' Westminster Review,' July 1, 1867, p. 5. 



