( lxvi ) 



specimen of Stenopteryx hirundinis. a parasite on swallows and 

 martins, found on Box Hill, Surrey, in August. 



Mr. G. T. Porritt brought for exhibition specimens of 

 Odontopera bidentata ab. nigra, and stated that the form was 

 rapidly increasing in the Wakefield district of South Yorkshire. 

 Apparently, in a few more years it would oust the ordinary 

 form prevailiug there completely. 



Dr. F. A. Dixey exhibited examples of five species of South 

 African Pierinai, in further illustration of geographical and 

 seasonal variation. The exhibit, which was supplementary to 

 that shown on November 15, comprised specimens of Eronia 

 cleodora, Hiibn., from East London and Natal, Belenois severina, 

 Cram., from Natal and Rhodesia, Teracolus speciosus, Wallgrn., 

 Piiiacopteryx pigea, Boisd., and P. charina, Boisd., all from 

 Natal. In every instance the contrast between forms captured 

 during the dry months of the year and specimens of the same 

 species! taken in the same localities during the rains was very 

 distinct. Two points were mentioned as being especially 

 worthy of note. The first was the extremely " dry " character 

 of the examples of E. cleodora taken both in August and 

 September at East London as compared with those taken in 

 August at Durban. The difference was so well marked and 

 so constant as to suggest the existence in the region south- 

 west of Natal of a distinct local race. The second point was 

 the appearance presented by the " dry season " examples of 

 B. severina from Rhodesia, in which the dark veining of the 

 under-side of the hind-wing tended to become faint or to 

 disappear ; this disappearance of the veining being in Natal 

 specimens a mark of the " wet season " phase of the species, 

 while the " dry season " forms from Durban were in nearly 

 every instance heavily veined beneath. Dr. Dixey further 

 remarked that the seasonal relations of the various forms of 

 B. severina had always been somewhat of a puzzle, and the 

 difficulty seemed to be increased rather than diminished by a 

 consideration of the present specimens. More data were 

 needed in regard both to this species and to the nearly-allied 

 B. mesentiua, before any satisfactory conclusion could be 

 reached. With regard to the exhibit as a whole, he was well 

 aware that by selecting instances it was often possible to make 



