188 BULLETIN 15 7, U. S. NATIONAL MUSEUM 



In the vicinity of Boston the usual type of female is light clear 

 yellow, and of the same size as the male, or only very slightly larger. 

 The color pattern is essentially that of the male, though usually the 

 black markings are somewhat heavier. There is also another type of 

 female which is ochreous in color and seems to occur only in the 

 summer brood and among the latest individuals of the spring brood. 



In the character of the submarginal band on the undersurface of 

 the fore wings and in the characters presented by the limbal area 

 on the undersurface of the hind wings the light yellow females show 

 the same intergradation with more southern specimens as do the 

 males. This is especially interesting in view of the fact that they 

 never depart from the characteristic male color pattern further than 

 to show a slight increase in the size of the black markings and usually 

 also a broadening of the black border of the hind wings, on which 

 there are always, in the specimens at hand, patches of scattered blue 

 scales between the marginal lunules and the yellow discal area, such 

 as rarely occur in the males. 



The ochreous females from Boston are usually considerably larger 

 than the males and the light-yellow females. The black markings 

 are very heavy. The submarginal band on the undersurface of the 

 fore wings is usually of the canadensis type, and they usually agree 

 with canadensis rather than with glaucus in the characters of the 

 limbal area on the undersurface of the hind wings. I have a speci- 

 men, however, which, together with an uninterrupted band on the 

 undersurface of the fore wings, has the limbal area of the under- 

 surface of the hind wings bordered by broad crescents with pointed 

 ends which are more deeply curved than in any southern specimen 

 at hand. Though in the ochreous females the amount of blue scaling 

 on the limbal area of the hind wings above is usually no greater than 

 it is in the light-yellow females, it occasionally takes the form of a 

 large and conspicuous blue spot in each interspace, which is quite as 

 large as in some of the ochreous females from the vicinity of Wash- 

 ington. The black markings in the ochreous females from Boston are 

 always more extensive than in the females from farther south. 



The two types of females found about Boston seem to intergrade. 

 The light-yellow female scarcely differing from the male in colora- 

 tion is quite different from any of the female types found in the 

 vicinity of Washington, this difference being particularly marked by 

 the absence of extensive blue scaling on the hind wings. The north- 

 ern ochreous females are always more heavily marked than those 

 from the south, but they approach the latter in the occasional great 

 development of the blue patches on the hind wings. 



The individuals of the spring brood in eastern Massachusetts are 

 more like the northern and less like the southern form than those 

 of the summer brood, especially the females. 



