SEXUAL DIVERSITY 217 



multiform and multitudinous. The lines of erect 

 hairs on the upper surface of the wings of some 

 Satyrinae and Argjmnini, the gland-like spot at the 

 base of the wings or the powdery band at the mar- 

 gin in some Rhodocerini, the little oval disk near 

 the middle of the front edge of the upper surface 

 of the fore wings of most Theclini, the pocket be- 

 side the first median nervule of the hind wings of 

 Anosia, the innschlag or fold of the front edge of 

 the fore wings in many Hesperini, and the velvety 

 dash in the middle of the fore wings of nearly all 

 the Pamphilini, always confined to the males, — 

 these are all accessory sexual peculiarities found 

 on the wings alone, and are quite on a par with 

 the characteristic plumage of the males in many 

 birds. Or, if one seek something still closer, he 

 may find it in the bristling front of the head of 

 the Theclini. 



So when we come to color, and, to a certain very 

 limited extent, to its distribution in definite ar- 

 rangement upon the surface of the wing, we find 

 the same thing. Here we may pass from the sim- 

 plest imaginable distinctions to those which are quite 

 extraordinary. In the Painted Beauty (Vanessa 

 huntera), for example, a slender, short, transverse 

 stripe near the apex of the upper wings is white in 



