233 
Entomological Society, 
combined friction against the front of the prothorax, but added that 
this view required further observation. 
Mr. F. Bond exhibited a very small papyriceous nest of a wasp, 
which had been suspended to a twig by a piece of horse-hair. 
Mr. Moore, jun., exhibited several chrysalids of moths, the inte- 
rior of which was filled apparently with minute parasitic Acari. 
Mr. Westwood exhibited an extensive series of Cremastocheilidce, 
from the collections of the Royal Museum of Stockholm, Messrs. 
Hope, Schaum (including the types of the species described by M. 
Gory), Turner, &c. He also stated that Entomobia Apum, described 
by Signor Costa (in a work presented the same evening), was the 
Braula cceca of Nitzsch; and that M. Blanchard had recently pub- 
lished a memoir on the impregnated state of the Hippobosca, in the 
bodies of which he had detected larvae, contrary to the observation 
of M. Leon Dufour. 
Mr. Newport, in reference to the statement made at the last meet- 
ng, of the immature state of the ova in some specimens of Sphinx 
Atropos and Convolvuli, observed that he had recently dissected a 
female of the latter species which had remained in the chrysalis state 
nearly its full period, and that he had detected the ovaries, but in a 
very slightly developed state, and which, he did not consider, would 
have ever arrived at their full state of development. A consider- 
able discussion as to the cause of this non- development of the ova 
took place, in which Messrs. Marshall and Westwood having sug- 
gested that it was owing to the great heat, Mr. Newport stated 
that he had found the ova as fully developed in specimens of Vanessa 
Urticce which had been produced from the chrysalis in from to 
9^ days, in a mean highest temperature of 70° to 75°, as in others 
which had remained in chrysalis thirteen or fourteen days with a 
mean highest range of temperature of from 55° to 60°. V. lo was 
developed in a few hours over ten days, when the mean lowest 
temperature during that period was 71°'06, and the mean highest 
75°'55. This may alford some explanation of the fact, that the two 
broods of V. lo usually appear in this country only in the hottest 
parts of summer, July and August, when, in its natural haunts, it is 
usually about fourteen days in the pupa state. 
Mr. E. Doubleday exhibited drawings of the ungues of the two 
species of Leptocircus, which he had found to be simple in the one 
and deeply bifid in the other. He also stated that Mr. Wing had 
obtained a larva of Sphinx Celerio found on a vine-tree at Paddington. 
The abundant occurrence of Vanessa Antiopa in different places 
during the past autumn was also noticed, especially at Tunbridge 
Wells by Mr. Stephens, at Yarmouth by Mr. Ingpen, and at Yaxley 
by Mr. F. Bond. 
December 7th. — W. Spence, Esq., F.R.S., Vice-President, in the 
Chair. 
Mr. Moore, jun., exhibited a quantity of flour infested with mites ; 
also the eggs of some species of Acarus } arranged in rows on the 
