112 



THE BUTTERFLIES OF THE 



Under side wh'ite, the vcnules all bordered with gray- 

 brown, most conspicuously on the median vein of both 

 wings and the branches of this vein on hind wings ; 

 shoulder pale orange. 



The female expands 1.9 inches; similar to the male, 



the surface usually still 

 . 26. more obscured. 



New York. 

 Summer form, OLE- 



RACEA-^STIVA, HaiT. 



This is often of larger 

 size of wings, and the 

 wings are thinner, and 

 purer white on the 

 upper side, than in 

 liiemalis(Fig. 26). Also 

 the base is less obscured, 

 and the costa, apex, and outer margin not at all. On the 

 under side it is either white or delicate yellow ; the veins 

 of both wings but scantily edged with brown scales, and 

 often not at all over considerable areas. 



The females have the basal and apical areas pale gray, 

 and not infrequently there is a trace of the spot of Napi 

 on upper median interspace ; sometimes also a trace of 

 the second spot, and of the gray bordering to the hind 

 margin of fore wings. The veins beneath are more 

 edged with brown scales than in the male. The shoul- 

 ders of hind wings are of a very pale yellow, and often 

 there is no color at all. 



New England to Michigan. 



The eggs, represented in Fig. 27, are somewhat pear- 

 shaped, pale greenish white in color, marked with about 



Pieris Napi, winter form, Oleracea-hiemalis : 

 a, larva. 



