300 



SEXUAL selection: mammals. 



Part IL 



singular colours 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 [Strefsiceros Kudu, fig. 62) have nar- 



Fig. 68. Tragelaphus scriptus, male (from tho Krowsley Menagerie). 



row 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 coloured ; in 

 D.])ygarga the back and neck are purplish-red, shading 

 on the flanks into black, and abruptly separated from the 



