SEXUAL COLOKATIOX. ^59 



species of curassows * as the more brilliant in colour. So, 

 too, the parrots formerly referred to different species of the 

 genus Eclertus, which have been shown by Dr. A. B. Meyer to 

 be merely the males and females respectively. 



The Upland goose (Bernicla mageilanica) is coloured in 



Fig. 32. Cinciiinurus rf </(<'.;> (male and female). 



both sexes by equally conspicuous tints ; it would be inter- 

 esting to ascertain the proportion of persons who declared 

 a preference for each sex. The female is a rich brown diver- 

 sified by white marks, while the male is black and white ; 

 both sexes are extremely beautiful, though the colours cannot 

 be said to be brilliant. 



* See Mr. Sclater's beautiful monograph of this group, Trans. Zool. Soc. f 

 vol. ix., p. 273, and vol. x., p. 543. 



