54 



THE BOOK OF BRITISH BUTTERFLIES. 



There is also an undated record near Kenley Station, 

 Surrey. It does not need a very close scrutiny of the 

 above to raise a suspicion that the English specimens 

 have crossed over of their own free will, or possibly 

 against it, from the* Continent, where the species is 

 common. The known migratory habits of its congeners 



PIERIS DAPLIDICE. 



lend plausibility to this theory. Or they may have been 

 accidentally imported in the egg or caterpillar stage from 

 abroad, for most, if not all, of the specimens taken have 

 belonged to the second brood. All the Pierides have 

 weak flight, and this one in particular, so once it is 

 recognised there will be little fear of losing it. It 



