XXXVl PROCEEDINGS OF THE 



3rd April, 1848. 

 W. Spence, Esq,, F.R.S., President, in the Chair, 



Donations. 



Philosophical Transactions of the Royal Society, parts 1 and 2 

 for 1845; parts 1 to 4 for 1846; and parts 1 and 2 for 1847. 

 Presented by that Society. 



Annual Report of the Leeds Philosophical Society for 1846 and 

 1847. Presented by that Society. 



Proceedings of the Berwickshire Natural History Club, pp. 

 197—260. Presented by that Club. 



H. T. Stainton, Esq., of Mountsfield, Lewisham, was balloted 

 for and elected a member. 



Exhibitions, Memoirs, &c. 



Mr. Douglas exhibited on behalf of Mr, Logan a new species 

 of Porrectaria, for which he proposed the name o^ fasclatopennella. 



Mr. Weir exhibited a specimen of the winter abode of the 

 larvae of Porthesia. 



Mr. E. Doubleday exhibited specimens of a remarkable new 

 genus of Geometridce, collected by Mr. Dyson in Caraccas, at an 

 elevation of nearly 10,000 feet above the level of the sea. 



A memoir by Mr. Dallas was read on the Hemipterous genus 

 Pcecilochroma, White, in which some new species were described. 



Mr. Douglas stated that on the preceding day he had seen a 

 specimen of Vanessa Antiopa at Penge. 



The President called the attention of the meeting to an account 

 of a swarm of Notonecta glauca, extending over twenty-five or 

 thirty miles, observed in September, 1846, near the head waters 

 of the Mississippi by Sir G. Simpson, and recorded by him in his 

 Travels. This, he observed, was a remarkable fact, and he be- 

 lieved the first recorded observation of the migration in large 

 swarms of an aquatic insect. 



The President also read an extract from the Times newspaper, 

 stating that during the prevalence of the cholera in Russia the 

 bees kept themselves closed up in their hives. This led to a dis- 

 cussion on the sensibility of insects to atmospheric changes. 



The President read an extract from the Florist, No. 3, on the 

 winter quarters of the caterpillar which infests the rose bud ; 

 from which it appears that they bore into the pith of the dead 



