75 



and AiTan, and show a very considerable difference in coloration. 



In the first place, I would like to call attention to the manner 

 in which this insect will vary, even from the same locality. The 

 first two columns of insects shown from S.E. London were bred 

 from larvae taken from the same spot in the years 1912 and 

 1917. There is not only an entire difference in coloration, but 

 also in the shape of the wings; those of the 1917 series are 

 perfectly normal, but the 1912 specimens are much more elongate. 

 In one case you have the insect with a red brick coloration, in 

 the other it is strongly suffused with yellow. 



The specimens from Cambridge follow very closely the S.E. 

 London specimens, as likewise *do those from Essex, the climatic 

 conditions at these distances apart not being of sufficient variation 

 to affect the insects. 



The Lincoln specimens call for no particular comment. The 

 series is not sufficiently long to enable one to say much about 

 them, more particularly as they are captured specimens, and the 

 ground colour is likely to have been somewhat affected. 



The series of Irish specimens from Tyrone are best looked at 

 in comparison with those from Scotland. They are of a richer 

 coloration, and the first specimen is very similar to the first 

 specimen from Scotland, inclining more to the salmon yellow 

 ground. 



The richest coloration is undoubtedly found in the Scottish 

 specimens, which at the same time are much darker, doubtless 

 due to the colder climatic conditions and moisture. 



You will note how closely the specimens from Kincardine and 

 Paisley follow in ground colour the salmon-yellow of the specimens 

 from Inverness, which were taken by our late member, Mr. 

 McArthur. 



Referring to the underside of the insect, I show three series of 

 these, i.e., from S.E. London, from Arran, and from Paisley 

 respectively. 



All the specimens from S.E. London are exclusively light, with 

 a greater or lesser amount of cream ground colour in the hind- 

 wings, between the basal patch and the outer margin. 



Specimens from Arran are perfectly uniform in regard to the 

 space referred to, showing no cream ground whatsoever, the whole 

 space being filled up with light chocolate coloui. 



The Paisley specimens, again, are entirely dissimilar, showing 

 extremely black scaling (several cases are of the variety pularia), 



