( xxxvi ) 



Dr. Sharp exhibited specimens of Cychramiis luteus and 

 fungicola, Auct., and stated that they are the sexes of one 

 species, C. luteus being the male, C. fungicola the female. In 

 working through the Central American Cychramini, he had 

 found that m some genera the males differed greatly from the 

 females in size and sculpture ; but this was not a constant 

 character, for in some species, while certain males scarcely 

 differed from the females in these respects, others were so 

 different that they would scarcely be recognised as belonging 

 to the same species. 



Mr. Edward A. Butler exhibited specimens of Platymetopius 

 undatus, Deg., from Ewhurst, Surrey. He remarked that the 

 species was recorded as having been once previously taken 

 near Plymouth by the late Mr. John Scott. 



Papers read. 



Mr. G. T. Baker read a paper entitled, " On the distribution 

 of the Charlonia group of the genus Anthocharis.'" Mr. Baker 

 stated that the species, six in number, of this small division 

 of the genus Anthocharis formed a very natural and closely 

 allied group, presenting many points of interest, both in their 

 relationship to each other and in their geographical distri- 

 bution, which extends from the Canaries on the west to the 

 valley of the Indus on the east. The author's theories as to 

 the causes of the present distribution of the group, which 

 were based on geological data, were discussed by Mr. Elwes, 

 Mr. M'Lachlan, Mr. Distant, and Mr. Stainton. 



Mr. Elwes read a paper entitled, "A revision of the genus 

 Argynnis." In the course of the discussion which ensued Mr. 

 Elwes expressed an opinion that in the fore wings of the males 

 of Argynnis pa phia, and some other species of the genus, there 

 was a dilatation or thickening of the nervules. Mr. Jenner 

 Weir stated that he thought that there was no real dilatation, 

 but that the apparent thickening of the nervules was due to 

 a dense covering of broad scales. He said he was supported 

 in his views by the opinions of Mr. S. H. Scudder, Dr. 

 Staudinger, and Dr. Schatz. The discussion was continued 

 by Mr. Distant, Prof. Eiley, and others. 



