122 GREEN-VEINED WHITE BUTTERFLY. 
yellow stigmata, and covered with white warts, which 
are blackish at the tip, and tufted with short hairs. 
The chrysalis is greenish-yellow, the angles very 
acute and prominent. 
This butterfly is one of the most common species 
both in this country and throughout Europe. Its 
first time of appearance is about the middle of May, 
and it is again abundant in the beginning of July. 
It presents numerous variations in its size and mark- 
ings, of which it is unnecessary to give a particular 
account. One of the most remarkable has been re- 
garded as a species by Esper and others, and de- 
scribed under the name of Napteee, It is of larger 
size than ordinary specimens of P. Napi, the upper 
wings with a black spot, the tip and some triangu- 
lar patches being of the same colour : the secondary 
wings rather pale, and having only the three first 
nervures dilated and greenish. This variety seems 
to occur not unfrequently. 
