18 

 PIERIS NAPI. 



Green-veined White. 



NAPI, Linn. Na'pi, from the name of one of its food-plants Bratsica 

 napus. 



This also is a common butterfly, but it prefers woods and hedge-rows to 

 gardens, and is less often seen in towns than brassicce and rapce. It is 

 generally distributed over the British Isles, but is not known to occur "Korth 

 of Eosshire. 



This is a very common species throughout Europe, and also in the North 

 and West of Asia, and Japan. Par north and also on the Alps, a suffused 

 variety of the female (Bryonia, Hub.) is met with. 



It is very briefly described by Dr. Merrett, in his " Pinax," 1667, and by 

 Kay, in 1710. 



frapi is easily distinguished from rapes, by the distinct greenish veinings, 

 branching over the disk of the under surface of the wings. On the upper 

 side, the fore-wings have dusky tips, and in the male there is a round black 

 spot in the middle, not very remote from the upper margin ; the female has 

 two such spots on the upper wings. The hind wings have a black spot on 

 the costa. 



The expanse of the wings varies from one inch and four lines to two inches 

 and two lines. 



Var. b. differs from the preceding in being spotless. 



Yar. c. (Sabellicce, Steph.) allied to the typical variety, but dissimilar in 

 form, the wings being shorter and more rounded. The under side of the 

 wings are adorned with very broad dusky veinings. I have one almost as 

 dark as Bryonia. 



Var. d. (Napaa Esp.) differs from the preceding by its larger size, by 

 having much larger sized spots, and also by having a much larger blotch at 

 the tip of the fore-wings. The hind-wings are rather pale, with the three 

 veinings above, green and dilated. The under surface of the hind-wings 

 have a yellowish tint, and the veinings are rather indistinct. 



There are at least two broods in the year, the first appearing about the 

 middle of April or May, and the second in the end of July, and continues on 

 the wing to the beginning of October. 



The egg is laid singly, on end, and is flask-shaped, with 14 longitudinal 

 ribs, not meeting very neatly, and with regular delicate transverse reticula- 

 tion. The colour is at first pale green, afterwards becoming more pale and 

 silvery ; thus, although much like the egg of rapa, it is longer, not so neat 



