38 [July. 



the insect should not be migratory because it is not cosmopolitan. 

 How many actual swarms of C. Edusa have been seen on the wing 

 migrating ? Have any ? Yet there are few Entomologists who doubt 

 that it does migrate ; but where is the positive proof ? 



Mr. Gross also asks, " If A. crat<xgi is migratory in its habits, why 

 do we not occasionally hear of its capture in Kent and other parts of 

 the South-East of England in those seasons when a larger number 

 than usual of such species as Pieris DapUdice, Argynnis Lathonia, 

 and other immigrants from the Continent occur ?" I do not believe 

 the same causes produce migration in different species. The weight 

 of evidence is contrary to the opinion that they do. How often have 

 the swarms of G. Edusa and Syale been coincident ? How many G. 

 ELyale, for instance, were taken in the Edusa year (1877) ? ; and has a 

 migration of P. hrassicce always accompanied one of Vanessa Antiopa ? 



I do not see how the absence of A. cratcegi in years when P. 

 DapUdice and A. Lathonia are reported " to occur in larger numbers 

 than usual" at all influences the question as to the migratory power 

 or not of that species. 



I quite agree with Mr. Goss that as it is an abundant species in 

 many parts of the Continent of Europe, there ought not to be any 

 difficulty in ascertaining from Continental Lepidopterists whether or 

 not it is migratory in its habits. Unfortunately in those species which 

 are acknowledged migrants, actual migration has rarely been noted. 

 It is, indeed, marvellous that so few cases are scattered throughout 

 our Entomological literature. 



Eayleigli Villa, Westcombe Park, S.E. : 

 April, 1887. 



HISTORICAL NOTES ON APOEIA CRATJEGI IN ENGLAND. 



BY C. W. DALE, P.E.S. 



At the meeting of the South London Entomological Society, on 

 January 27th, Mr. Jenner Weir stated that his opinion was that in the 

 earlier decades of the century a flight of this insect visited Sussex 

 from some part of the continent. Whether it be so or no, I will not 

 venture to dispute, but by consulting the works of Merrett ("Pinax"), 

 1667, E-ay, 1710, and Petiver, in 1717; we find that Aporia cratcegi 

 existed in England long before then. 



Mr. Goss, in the March number of Ent. Mo. Mag., gives as his 

 opinion that the extreme scarcity, or total disappearance of A. cratcegi 

 may be due to a succession of wet ungenial summers and mild winters. 



