COMMON CABBAGE BUTTEIIFLY. 115 



destroy the parent flies when they first begin to ap- 

 pear in May, before they have had time to deposit 

 their eggs. 



The butterfly is first seen on the wing about the 

 middle of May. but in the south of England it often 

 appears mucn earlier. It occurs abundantly in all 

 parts of Britain, and seems to be equally plentiful 

 throughout Europe. 



