ENTOMOLOGICAL SOCIETY OF LONDON. XXI 



Mr. Wing exhibited specimens of a species of Yponomeuta, 

 which feeds on apple trees, long confounded with Y. jx(del/a, but 

 which, being distinct, especially in the caterpillar state, it was 

 proposed to name Y. malivorella. 



Messrs. Westwood and Ingpen exhibited specimens of Aphis 

 Fabce, which had swarmed to an astonishing extent in various 

 parts of the west of England from the 14th to the 21st July; Mr. 

 Westwood reading extracts from various communications which he 

 had received on the subject, by which it appeared that their flights 

 were accompanied in some places by a heavy and highly electrical 

 state of the atmosphere ; and that although they had attacked a 

 great variety of plants, none of them had been found upon the 

 potatoe. Mr. Westwood also read some notes on the state of the 

 atmosphere from the 4th to the 17th July, whence he was led to 

 consider that it was owing to the sudden increase of heat, to not 

 less than eighteen degrees above the usual average at that time, 

 that the Aphides had prematurely acquired wings, whilst the elec- 

 trical state of the atmosphere had caused them to swarm to the 

 great extent which had been observed. 



Messrs. Doubleday and Schaum made some remarks, doubting 

 whether the increased heat of the period had led to the develop- 

 ment of wings ; and suggesting that the case in question was 

 rather an early production of the winged state of the species, 

 which did not ordinarily occur till the autumn ; the former gen- 

 tleman observed that he had noticed winged Aj^hides as early as 

 May. 



Mr. Ingpen stated, that each female specimen of Aphis vastator 

 produces ten young ones; and Col. Hearsey suggested how easily 

 these small families might be destroyed by hand in the early part 

 of the summer, thereby preventing the damage caused by the suc- 

 cessive generations. 



Mr. Spence read an extract from the Gardeners' Chronicle, 

 July 25, 1847, containing a notice by Mr. Williams, of Pitmaston, 

 on the recent swarms of the black Aphis of the bean, as well 

 as extracts from White's Natural History of '*elborne, and other 

 works ; whence he was led to remark on the want of our know- 

 ledge as to many of the facts concerning different species of 

 Aphides, the general statements which had been made respecting 

 them being inapplicable to each species. He thought it advisable 

 that a report sliould be drawn up detailing the positive facts 

 known respecting these insects. 



Some Notes on the capture of Paussidce, at the Cape of Good 

 Hope, by H. Benson, Esq. ; and 



