161 



species, but Mr. George Gray, conceiving them to be the sexes of one species, had 

 given P. Pollux as a synonym of P. Castor; the Professor, however, exhibited males 

 of both forms and females of P. Pollux, and he exhibited a specimen of P. Castor from 

 the collection of Mr. Semper, of Altona, one of the wings of which was partly of the 

 ordinary form of the male, whilst the remainder of the wing had the markings and 

 coloration which (judging from analogy) the female of P. Castor would possess. From 

 a consideration of these circumstances the Professor was still disposed to maintain the 

 specific distinctness of the two forms. Apart from its bearing on this question, Mr, 

 Semper's specimen of P. Castor was extremely interesting, as exhibiting a new phase 

 in hermaphroditism ; all the hermaphrodites with which he was previously acquainted 

 had some of iheir members of the form peculiar to one sex, and some of the form pecu- 

 liar to the other sex, but each limb was completely of one sexual form ; here, on the 

 other hand, the wing was partly male and partly female ; the wing itself was herma- 

 phrodite, the limb was gynandromorphous. It was to be noticed, moreover, that this 

 gynandromorphism did not extend through equal and corresponding portions of the 

 upper aud lower surfaces of the wing, but the sexual variation in marking and colour 

 was spread over a larger space on one surface than on the other; if he might so speak, 

 the gynandromorphism was in the plane of the wing, not perpendicular to that plane, 

 and the surface of contact between the male and female portions of the limb could not 

 be traced out by the motion of a straight line kept constantly perpendicular to the 

 wing-plane. 



Professor Westwood exhibited the imago of Eucheira socialis, a Mexican species 

 whose larviB were gregarious, and the family-cocoon of which had been described by 

 him in an early volume of the Society's ' Transactions.' 



Mr. Miller exhibited a specimen of (Ecophora Lambdella, taken by Mr. Butters, 

 near Grays, Essex. 



Mr. Stainton exhibited some hazel leaves which had been mined by the young 

 larvae of Micropleryx fastuosella, and which he had recently gathered in the neigh- 

 bourhood of Marlborough ; there were numerous leaves bearing traces of the former 

 presence of the larvee, but in one leaf only did he find a larva actually present; careful 

 search at an earlier period of the year would doubtless lead to the breeding of the 

 species in this country, and to a corroboration of the observations of Herr Kallenbach. 



Mr. Stainton mentioned that during his visit to Marlborough he had had the 

 pleasure of awarding a prize which had been oflfered by one of the masters at the 

 College for the best collection of insects formed during the previous year. There were 

 seven competitors, each of whom, in addition to the production of his collection, was 

 put through an examination in the elementary parts of the Science; and the result 

 was so satisfactory that Mr. Stainton was led to hope that^omething similar would be 

 done at other public schools, which would thus serve as nurseries for the Entomolo- 

 gical Societies of the Universities. 



Mr. Stainton exhibited his collection of original drawings of the larvae of Tineina, 

 a portion of which, with descriptions, had already appeared in the ' Natural History 

 of the Tineina,' whilst the remainder were intended for publication in the future 

 volumes of that work. 



Mr. Moore exhibited some elm leaves which had been attacked by a species of 

 Aphis ; and leaves of Veronica ChamiBdrys bearing galls produced by a dipterous 

 larva. 



