PEKONEA CRISTANA. 



269 



order to make the comparison as reliable as possible, were all 

 captured in one locality, which is of considerable extent. They 

 were, as the list states, taken in the years 1915, 1916, and 1917, 

 and the numbers represent the quantities of each form met with. 

 Many of the forms, and probably all, are exceedingly local ; for 

 instance, in certain thickets almost any specimen knocked out is 

 ab. nigrana ; one of these thickets which I have in mind has an 

 area of perhaps half an acre, but in the immediate neighbourhood 

 are other thickets that do not produce more than 8 or 10 

 per cent, of this aberration. This is, of course, to be expected 

 when one knows the extreme tendency in captivity of the 

 offspring to produce the parent form. 



List of Aberrations taken in the New Forest in the Years 

 1915, 1916, akd 1917, with the number of examples of 

 EACH Aberration Captured. 



In addition to the forty -three forms enumerated in the above 

 list, I am indebted to Mr. South, who has worked P. cristana for 

 many years in the New Forest, and who has kindly furnished me 

 with a list of eight additional forms which he has met with 

 there ; these are abs. nigrocristana, Clark, postchajitana, Webb, 

 subunicolorana, Clark, ruficostana, Curt., suhcapucina, Dsvs., 

 profanana, Fab., masoniana, Clark, a,nd Jiavostriayia, Webb ; and 

 this autumn I have received three specimens of ab. subcristalana, 

 Curt., a form which, whilst common at Folkestone, has, so far 

 as I am aware, not been previously met with in the New Forest. 



