DISSIMILARITY OF SEXES. 



577 



Many species are yellow, red, and black, distributed in various 

 ways, and in some the male is very gaily coloured, while the 

 female is plain black, white, and grey. 



Fig. 321.— Ixias Mariamna. 

 (Red, white, black, and brown.; 



The insect which is shown on the next page is a native of 

 Boura, one of the islands near Borneo. 



The figure which is there given represents the male, there 

 being a marked contrast in colour between the sexes. The 

 upper wings are edged with a band of black, broadest at the 

 tip. The centre of the wing is red, and the rest is bright yellow. 

 The lower wings are entirely yellow, except two angular black 

 spots. The female is quite unlike the male, being simply black 

 and grey, and so dissimilar are the sexes that even an accom- 

 plished practical entomologist like Mr. Wallace had some diffi- 

 culty in determining the identity of the species. 



Mr. Wallace has given, in the "Journal of Entomology," a 

 brief but graphic description of the habits of these Butterflies : — 

 " The species of Iphias are all large and handsome Butterflies, 



p P 



