186 DIVERSITY OF THE SEXES 



being tawny with indented brown borders and an 

 oblique black dasli in the middle of the front 

 wings ; at first glance no one could suppose them 

 identical. In the Goat- weed butterfly [Figs. 156, 

 157] the male is of a deep coppery red above, 

 bordered with dark purplish brown and blotched 

 and powdered with the same ; the female differs 

 in being of a lighter color throughout and in hav- 

 ing a broad, somewhat irregular belt of a still 

 lighter tint crossing both wings, but most con- 

 spicuous on the front pair, and brought into 

 greater relief by a distinct edging of blackish 

 brown. In the superb fritillary Diana (Semno- 

 psyche Diana), the male is a rich dark brown 

 with a very broad fulvous margin upon all the 

 wings, marked on the front pair by one or two 

 rows of small black spots. The female, on the 

 other hand, is a rich purple black, with no trace 

 of fulvous, but with the space where it belongs 

 occupied on the front wings by three rows of 

 white spots and dashes, and on the hind wings by 

 two belts of blue, broken into spots, one of the 

 belts narrow, the other exceedingly broad. In a 

 related butterfly almost equally superb, the Regal 

 Fritillary (Speyeria Idalia) [Fig. 158], the spots 

 of the outer row on the upper side of the hind 

 wings are deep orange in the male, pale bluish 

 white in the female ; forming a striking contrast. 

 Again, in that charming hair-streak, the Spring 



