222 SEXUAL DIVERSITY 



unlike most other fritillaries, but it retains, never- 

 theless, abundant traces of the same style of orna- 

 mentation, and has precisely the same colors ; 

 while the female departs widely from the charac- 

 teristic features of ornamentation in the group, 

 and in addition loses every trace of fulvous, so 

 that no one at first glance would recognize it as 

 a member of the Argynnini. Or, if it be objected 

 that a case of variation through mimicry should 

 not be used here, take the Clouded Sulphur 

 (Eurymus philodice), and its allies. In some 

 Eurymi, indeed, there are only pale females ; but 

 in others all, or most of the females, are j^ellow or 

 orange, like the males ; and any one who knows 

 how yellow and orange tints prevail throughout 

 the group of Rhodocerini will acknowledge that 

 the color of the males is normal. So, too, with 

 the blues (Lycaenini), which Darwin himself 

 quotes ; in almost all of them, both males and 

 females are of some shade of blue ; in compara- 

 tively few, the males are blue and the females 

 brown ; in exceedingly few, both sexes are brown ; 

 and the very fact that they are familiarly known 

 as "■ blues " is a pojiular recognition of the pre- 

 vaihng color. In the group of skippers to which 

 Thymelicus brettus belongs (Pamphilini), the 



