IN COLORING AND STRUCTURE. 189 



all its numerous members the same characteristic 

 play of fulvous and black markings. The male 

 of Diana is Indeed very unlike most other fritil- 

 laries, but it retains nevertheless abundant traces 

 of the same style of ornamentation and has pre- 

 cisely the same colors ; while the female departs 

 widely from the characteristic features of orna- 

 mentation, and in addition loses every trace of 

 fulvous, so that no one at first glance would rec- 

 ognize it as a member of the group. 



Take again our common Sulphur Yellow and its 

 allies [see Figs. 102, 103] ; in some species, in- 

 deed, there are only pale females ; but in others 

 most or all of the females are yellow like the 

 males, and any one who knows how yellow and 

 orange tints prevail throughout the whole group 

 to which the genus Eurymus belongs will ac- 

 knowledge that the color of the males is normal. 



So too with the blues, which Darwin himself 

 quotes ; almost all of them, males and females, 

 are of some shade of blue ; in a considerable num- 

 ber the males are blue and the females brown ; in 

 only one, so far as I know, are the males some- 

 times brown and the females blue ; in exceed- 

 ingly few both sexes are brown ; and the very 

 fact that they are familiarly known as the 

 ' ' blues' ' is a popular recognition of the prevail- 

 ing color. 



In the group of skippers to which Brettus be- 



