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GREEN- VEINED WHITE BUTTERFLY. 
Pontia Napi. 
PLATE IX. Fig. 1. 
Pap. Napi, Linn Lewin , pi. 27 Donovan, viii. 23. pi. 28ft 
fig. 1. — Green-veined white, Harris. 
The wings of this species expand from 17 to 22 
lines ; the colour white, inclining to yellow. The 
tip of the primary wings is dusky, and in the male 
there is a round black spot near the middle, not very 
remote from the outer margin, the female having two 
Buch spots on each wing. The hinder wings are 
free from marks, except the ordinary dusky spot on 
the anterior margin. On the under side, the tip of 
the primary wings, and the whole of the secondary 
pair, are sulphur-yellow, the nervures strongly mark- 
ed with a dilated line of dusky green ; and there are 
two black spots on the upper w r ings, near the hinder 
margin. The body and antenna are nearly as in the 
preceding species. 
The caterpillar feeds on tetradynamous plants, 
paiticularly those belonging to the genus Brassica. 
It is of a dull green colour, lighter on the sides, with 
