The British Butterflies Described 



belted round the back and attached at the tail. If you 

 should find chrysalids in this position during the winter 

 months and wish to remove them, cut away the whole 

 support, and set them up again in your hatching cage, as 

 you found them. Always avoid unnecessary handling 

 of these delicate objects. 



There are certainly two, and probably three, broods 

 during a favourable summer, so this butterfly may be 

 captured from May to August. Its headquarters are in 

 the Fen counties of Cambridge and Norfolk, and it is 

 found in many similar localities in fewer numbers. 



BLACK-VEINED WHITE (Aporia Crat^egi\ Plate I., 

 Fig. 2. This is one of the rarest of our butterflies, 

 though why it should be so is rather difficult to say. 

 As it feeds upon hawthorn in the larval state the puzzle 

 is all the greater, as a commoner or more widely 

 distributed plant it would be hard to find. It may be 

 also found on blackthorn, cherry, plum, apple, and 

 pear. It is not difficult to distinguish this fine insect 

 from all the other " Whites " on our list. The wings 

 are rather thinly scaled ; you can note this by holding 

 the insect up to the light, and looking through the 

 wing with an ordinary pocket-lens. Do the same with 

 its near neighbour, the Large Garden White, and you 

 will see a difference the Black- Veined White is semi- 

 transparent, while the other is quite dense. 



The almost black network of veins is another un- 

 mistakable feature, as is the entire absence of a fringe 

 to the wings. Two and a half inches is the average 

 expanse of the extended wings. 

 32 



