Entomological Society. 233 



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 Cremastocheilidcc, 

 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 cccca 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 8| to 

 9t? 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. To was 

 developed in a few hours over ten days, when the mean lowest 

 temperature during that period was 71 o, 06, and the mean highest 

 75°"55. This may afford some explanation of the fact, that the two 

 broods of V. Io 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 Leplocircus, 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 



