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. 



Tins 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 Napcece. 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 

 nervines dilated and greenish. This variety seems 

 to occur not uufrequently. 



