98 



Mr. Robert Adkin exhibited a series of Teras contaminana 

 from Polegate. His object in showing this very common 

 species was, he said, an endeavour to interest some of our 

 younger members in the Tortrices. The individuals of the 

 series varied very much, and were all taken from a few 

 blackthorn bushes on an afternoon in September last, when 

 there was really nothing else to be found. Many other 

 species of Tortrices might be taken in a similar way, and he 

 was sure that many members who appeared to take little or 

 no interest in the smaller species of Lepidoptera might often 

 with advantage fill in a blank day by looking after such 

 species as the one exhibited, and would soon learn to take an 

 intelligent interest in them. 



The following members then brought to the table selected 

 specimens, series, or broods of Pieris napi : — Messrs. Harri- 

 son and Main, Montgomery, Rayward, Newman, Joy, 

 Turner, Grosvenor, Garrett, Sich, Adkin, Dr. Chapman and 

 Dr. Hodgson. 



Messrs. Harrison and Main: Broods of South English, Irish, 

 Cheshire, and Swiss origin, including var. bryonies and cross- 

 ings of English and Swiss pairings. 



Mr. Montgomery : Broods from dark Kilkenny parents. 



Dr. Chapman : Examples from Finland. 



Mr. Joy : An example two years in pupa. 



Mr. Garrett : An extremely small example. 



Mr. Turner : Very pale undersides from the Continent. 



Mr. Sich : An extremely dark form taken in Middlesex in 

 1874, approaching var. bryonies. 



Dr. Hodgson : Well-marked spring forms, comparable to 

 ordinary summer forms, and extremely pale spring forms. 



Mr. Rayward : Series from Cornwall, Fife, and Surrey. 



Mr. Main then read a short paper entitled, " Some Notes 

 on Pieris napi " (see p. 16). 



In the course of the discussion following the exhibition, 

 Mr. A. L. Rayward confirmed Mr. Harrison's statement as 

 to the difference in size between the spring and summer 

 broods of P. napi, and, with regard to the frequency with 

 which pupa? from spring parents lie over until the following 

 spring, instead of emerging as a second brood, stated that, 

 although temperature almost certainly has a considerable 

 influence in determining the percentage of the summer 

 emergence, temperature and food supply are insufficient in 

 themselves to account for the tendency of the pupae to lie 

 over, and there appears to be some, as yet unknown, factor 

 inherent in Napi, and in many other species of Lepidoptera, 



