EASTERN UNITED STATES. 



113 



FIG. 27. 



fifteen sharp longitudinal ridges with cross-lines between. 

 Length about .05 of an inch. 



The young larva is of a glassy white, thinly clothed 

 with fine short hairs. As with several other species, the 

 egg-shell from which it emerges forms the 

 first meal of the young larva. 



The mature larva is about 1.25 inches 

 long, of a pale green color, with a darker 

 dorsal line, the entire surface covered with 

 fine short whitish hairs. 



The chrysalis is of a greenish or whitibh 

 color finely speckled with black, and shaped 

 much as the other species. 



The larva, when ready to pupate, leaves P- Napi) f orm 

 the cabbages and seeks some protected place oieracea; egg, 

 on the under side of a board or a fence-rail, 

 where it spins its button and loop of silk and changes 

 to a pupa. This habit is not confined to this species, 

 but is common to the rest of the genus occurring in the 

 eastern United States. 



13. PlERIS VlRGINIEXSIS, Edw. 



This is a form occurring in West Virginia, like Oie- 

 racea, except that it has no yellow on the under side of 

 the wings. It is single-brooded, producing no summer 

 form, while farther north the aberrant form Virginien- 

 sis is one of the spring forms of Oieracea, and the parent 

 of Oleracea-wstiva, a summer form. The preparatory 

 stages are like those of the preceding species, it seeming 

 to be a descendant of one of its forms, probably Ole- 

 racea-cestiva. 



West Virginia. 



h 10* 



