106 



Mf. Frohawk said that in calm weather many observations had 

 been made of these migrations, which appeared to be quite- 

 vokmtary, and he instanced a case in Switzerland in which for 

 hours individuals of a species had been noted as passing a 

 particular spot, all flying definitely in the same direction every 

 minute or two. 



Mr. Turner recalled the remark of the late Mr. McArthur 

 that one of the best opportunities, which occurred to him while 

 colleqting in the Himalayas, was to capture the swarms of butter- 

 flies which came up from the lower valleys against the wind 

 blowing down from the mountain slopes. 



Mr. Frohawk noted that a head-wind afforded excellent facility 

 for birds to rise against the wind, and Mr. Brooks referred to the 

 advice of old collectors at Wicken, that the sheet and light should^ 

 be so arranged that the moths would come up against the wind. 



Mr. Leeds and Mr. Adkin had seen migrations come in from the 

 sea in quite calm weather, and Mr. Adkin said that the method of 

 flight of the insects he had observed on migration quite gave him 

 the impression that it was a voluntary matter. He referred to the 

 case of quantities of Plunia ijanuna going up straight into the air 

 from a wheat-field, completely out of sight. 



NOVEMBER 9th, 1916. 



Mr. G. W. Mason of Ealing was elected a member. 



Professor Bateson, F.R.S., gave a lecture with lantern and other 

 illustrations entitled, " Remarks on the Mendelian Theories, with 

 especial reference to recent extensions in their applicatton made 

 in America." Some discussion subsequently took place. 



Mr. G. T. Porritt exhibited a gynandromorph specimen of 

 Lasiocaiiipa querciis and an olive-banded male of the same 

 species, both from the moors near Huddersfield. Also a lemon- 

 yellow male of Cosmotridie potatoria from Cambridgeshire. 



Mr. J. Platt-Barrett exhibited a considerable number of Lijranidie. 

 taken by himself this season, and contributed the following notes 

 on his exhibit. 



" This season I have seen seven species of Li/ran idtr on the wing. 



" 1. Celastn'na ari/iolitx. Forest Hill as usual. 



"2. I'oli/iinnnatiis icanis. Mid Kent, the end of May, one speci- 



