THE YOUNG NATURALIST. 227 



but less likely to be found than on the sparsely covered growth of the 

 sand-hills. 



Mr. Sharp fails to see how I can agree with his previous paper 

 Young Naturalist, pp. 97-9. He there says, " The forces arrayed 

 against immature life are as complex as they are variable. We have 

 first the weather, then the effect of other animal life, then the in- 

 fluence of plant life, and these three so interact, and are so mutually 

 dependent and contingent, &c." This I fully endorse, but I also 

 believe that the erratic appearance of Galii in England is due to the 

 fact that it cannot live and thrive here, and is only to be found after a 

 migration of that insect to this country, such as 1859, 1870, and 1888. 

 What causes this migration, what instinctive motive brings it about, 

 we are powerless to and unable to comprehend. 



Reports of Societies. 



ENTOMOLOGICAL SOCIETY OF LONDON. 



October 2nd, 1889.— The Right Hon. Lord Walsingham, M.A., F.R.S., President, 

 in the chair. Mr, Arnold Umfreville-Henn, of Heaton Chapel Rectory, near Stock- 

 port, elected a Fellow. 



Mr. F. P. Pascoe exhibited a number of species of insects of all orders, collected 

 by himself during the past summer at Brindisi, and in Greece and the Ionian Islands. 



Mr. J. W. Douglas sent for exhibition specimens of Lygus visicola, Puton, a species 

 new to Britain, taken at Hereford, in September last, exclusively from mistletoe, by 

 Dr. T. A. Chapman. 



Mr. R. M'Lachlan exhibited nearly one hundred species of Trichoptera recently 

 collected in Iceland by Mr. P. B. Mason. Only six species were represented, and of 

 these, five had been previously recorded from the island. He remarked on the great 

 amount of variation existing in some of the species. 



Mr. E. B. Poulton exhibited a mounted specimen of the yellow powder from the 

 cocoon of Clisiocampa neustria, under a power magnifying 188 diameters. The pow- 

 der was thus seen to consist of crystals so minute that the form could only just be 

 made out. He said the powder was present in a crystalline form in the malpighian 

 tubes, and was discharged from the anus of the larva. A discussion ensued as to 

 the functions of the malpighian tubes, &c, in which Mr. Stainton, Lord Walsingham, 

 Mr. M. Jacoby, Mr. P. B. Mason, Mr. M'Lachlan, and Dr. Sharp took part. 



Mr. Poulton also exhibited some photograps of living larvas of Hemerophiha 

 abvuptaria, showing different depths of colour which had been induced by experiment ; 

 specimens of the larvas preserved in spirit were also shown, together with water- 

 colour representations of two varieties. He said that, as in other experiments of 

 the kind, the larvae had been rendered very pale by being surrounded by green leaves 



