83 



France, having seen it near Boulogne amongst sainfoin, and being 

 a strong flier it would, on a fine day and with a favourable breeze, 

 easily cross the channel to Britain. He considered that Fabricius' 

 name, ediisa, should be retained for our " Clouded Yellow " 

 butterfly. 



The President (Mr. B. H. Smith) said that during his four years 

 residence at Warlingham, Surrey, he had met with C. ediisa each 

 year in greater or lesser numbers, except in 1910, in which year not 

 only had he failed to find it, but a friend who was not under the 

 disadvantage of having to be in London during the day, and who 

 had kept a careful record, had not met with a single specimen in 

 that year. He thought it might reasonably be concluded that it 

 was absent from the Warlingham district in 1910. In 1912 he 

 had seen the species on the wing in some numbers as late as 

 October 16th at Sidmouth. In regard to rearing the species, he 

 said that a female which he took on September 15th, 1911, 

 deposited ova sparingly on sprigs of red clover on the 17th, but 

 during several stormy sunless days that followed none were laid. 

 The weather improved on 22nd, and on the female being placed 

 in the sunshine she deposited freely on the leaves, and occasionally 

 on the stalks of the clover during the succeeding daj^s, which were 

 very sunny. The eggs hatched out between October 10th and 

 15th, and the larvae passed the 1st, 2nd, and 3rd instars success- 

 fully in a greenhouse, when the temperature was never allowed to 

 fall below -lO degrees ; but in January there was a heavy mortality, 

 possibly on account of the supply of lucerne, on which up to that 

 time they had been fed, running out and clover being substituted 

 for it. Of those remaining, some half dozen only reached the 

 pupal stage, and only three imagines emerged. 



Mr. L. W. Newman, referring to the migration of C. edusa, said 

 that he was able to fix the date as Whit- Sunday or Whit-Monday, 

 1892, on which he witnessed in a field at Singleton, near Good- 

 wood, enormous numbers of the species, including a fair per- 

 centage of var. helice, and had no doubt that he had beheld the 

 arrival of a migratory swarm. On the following day not one was 

 to be seen in the field, the swarm having evidently passed on, and 

 the individuals dispersed themselves over the country. With 

 regard to P. brassica', he could not agree with Mr. Sich's sugges- 

 tion that a series of hard winters would be fatal to the pupcne. He 

 instanced his treatment of about a hundred pupse which he had 

 kept in a heated room from November to January with a view to 

 forcing the emergence of the imagines. As none came out, be 



