XXV111 
JOURNAL OF PROCEEDINGS. 
its ravages, discovered by Mr. Day, by laying slices of potatoe 
upon the surface of the ground in the neighbourhood of places fre- 
quented by them, and by examining them every morning, when 
considerable numbers cf the worms were to be found upon them. 
It had been noticed, that burying the potatoe a short distance 
under-ground, was not nearly so advantageous. 
He also exhibited, by permission of the Naval and Military Mu- 
seum, two very large nests of an unknown species of Polistes from 
the river Plata. 
Mr. Westwood exhibited the collection of Chalcididce and other 
minute Hymenoptera, now belonging to the museum of Bonn, but 
formerly to Dr. Nees von Esenbeck, by whom they had been de- 
scribed in the Hymenopterorum Monographic , and by whose desire 
they had been forwarded to Mr. Westwood for examination. 
He also exhibited specimens of JEpus fulvescens, and of one of the 
Staphylinidce , together with some Coleopterous larvae and pupae, 
apparently of the last-named species, and a small species of Podura, 
forwarded to him by Dr. Johnston, by whom they had been cap- 
tured on the sea-coast at Berwick-upon-Tweed at a considerable 
distance below high water-mark. (The Staphylinideous insect, to- 
gether with its supposed larva and pupa, has been subsequently 
described by Mr. W r estwood in the Magazine of Zoology and 
Botany, under the name of Micralymma Jolmstonce.) 
Mr. Bow r erbank exhibited a specimen of the beautiful Castnia 
coronis, found flying on the outside of one of the hothouses of 
Messrs. Loddiges, of Hackney, and supposed to have been im- 
ported in the pupa state from South America, of which it is a 
native. 
The following memoirs were read : — 
“ On the Habits of the House Ant, Myrmica unafasciata?” By 
Dr. Bostock, F.R.S. 
“ Notes respecting the Variety of the Silk-worm which produces 
White Silk.” By W. Sells, Esq. 
“ On the Evaniidce and some allied Genera of Hymenoptera .” 
By J. O. Westwood. 
“ Observations upon the Larva of the Haltica nemorum and other 
Turnip- feeding Insects.” By Henry Le Keux, Esq. Communicated 
by W. Raddon, Esq. 
In the discussion which ensued upon Dr. Bostock’s paper, Mr. 
Waterhouse stated that he had found it in the neighbourhood of 
Billingsgate. Mr. Desvignes noticed a plan adopted in China in 
similar cases, where ridges of salt are laid round the nest of the 
