SOCIETIES. 253 



1903, a large specimen taken while tiying feebly in Surbiton, Surrey ; 

 probably it had not long emerged. June 21st, 1903, a specimen taken 

 at Balham, London. June 2]st, 1905, one taken at Horsley, Surrey. 

 June 18th, 1907, one brought to me from Walton-on-Thames, Surrey. 

 June 26th, 1909, one specimen, near Oxshott, Surrey. June 9th, 1910, 

 an example taken from a fence in Fassett Road, Kingston-on-Tliames, 

 Surrey.- June 12th, 1910, one taken at Claygate, Surrey. I have 

 also two undated specimens from Macclesfield, Cheshire, given me by 

 Mr. R. South.— W. J. Lucas ; Kingston-on-Thames. 



A Dipterous Parasite bred from imago op Nyssia LArroNARiA. — 

 In April, 1909, amongst some females of Nyssia Iwpponaria, Bdv., 

 from which I was hoping to obtain ova, I was surprised to find one, 

 which had been able to walk about three days l^efore, lying on its 

 back and by its empty body the pupa of a dipterous parasite. From 

 this the fly emerged twenty-two days later, and has been identified by 

 Mr. C. J. Wainwright as a female of Phryxe vulgaris Fall. He has 

 also been kind enough to tell me that, though it is an unusual event 

 for an insect, parasitised in the larval stage, to develop fully, it is by 

 no means unknown. But, if these flies have several broods, it seems 

 to me possible that the egg was laid in the imago and that the whole 

 oval and larval development of the fly took place in this stage. 

 Females of Nyssia laiyponaria almost always live more than a fortnight, 

 and some of these parasites pass through their early stages much more 

 quickly than this. Apart from the rarity of the occurrence, it has a 

 further interest in that, so far as I know, it is the first recorded 

 parasite bred from Nyssia lapponaria in this country. — E. A. 

 Cockayne ; 16, Cambridge Square, London. 



SOCIETIES. 



Entomological Society of London. — Wednesday, April btii, 

 1911.— The Rev. F. D. Morice, M.A., President, in the chair.— The 

 following gentlemen were elected Fellows of the Society : Messrs. 

 H. W. Davey, Inspector of the Department of Agricvdture, Geelong, 

 Victoria, Australia; H. Boileau, 90, rue de la Cote St. Tiiibault, Bois de 

 Colombes, Seine, France ; Rufus Mallinson, Oakland, Windermere. — 

 The President announced the death of Mr. P. C. T. Snellen, of 

 Rotterdam, the oldest Honorary Fellow of the Society, and moved that 

 an expression of sympathy be forwarded to his family. — Mr. Robert 

 Adkin exhibited, on behalf of Mr. Lachlan Gibb, of Montreal, Canada, 

 three specimens (two males and one female) of a Pieris taken by 

 Mr. Gibb at Lost River, Canada, in May, 1910, together with series 

 of P. oleracea and P. rapce fi'ora the same and other Canadian 

 localities for comparison. Mr. Gibb mentioned that P. rapoi was not 

 an indigenous species, but was said to have been introduced into 

 Canada some sixty years ago, and had not only thoroughly establislied 

 itself, but had become one of the commonest butterflies, whereas 

 P. oleracea, an indigenous species, appeared to be rapidly declining 

 in numbers, and it had been suggested that the introduced species 

 was driving it out. He asked the opinion of the Fellows upon the 

 three specimens, and suggested the possibility of their being the 



