324 THE ENTOMOLOGIST. 
Abraxas grossulariata, and a specimen of Teniocampa stabilis, with a 
distinct light band bordering the hind margin of the upper wings. He 
stated that he had bred both specimens. Mr. EH. B. Poulton exhibited 
two series of imagos of Gnophos obscurata, which had been subjected to 
dark and light surroundings respectively. ‘The results were seen to be 
completely negative, the two series being equally light. Mr. F. 
Merrifield showed a number of pupe of Pieris napi. About eight of 
them, which had attached themselves to the leaves of the cabbage 
plant on which they were fed, were of a uniform bright green colour, 
with light yellowish edgings; of the others, those which had attached 
themselves to the black net covermg the pot, or the brownish twigs 
which supported it, nearly seventy in number, were dark coloured, 
with dark spots and lines. The remainder were of a green colour, much 
less vivid than that of those which had spun up on the leaves, with 
numerous dark spots and lineson them. Mr. R. Adkin exhibited three 
bred female specimens of Vanessa c-album, two of which belonged to 
the first brood, and the third to the second brood. One of the speci- 
mens of the first brood was remarkable in having the under side of a 
very dark colour, identical with typical specimens of the second brood. - 
He thought the peculiarity of colouring in this specimen had been 
caused by a retarded emergence from the pupa, due to low tem- 
perature and absence of sunshine. Mr. F. W. Frohawk exhibited a 
series of striking varieties of Satyrus hyperanthus bred from ova laid by 
a female taken in the New Forest in July last. Mr. F. D. Godman_ 
exhibited a specimen of Amphonyw medon, Cr., received from Jalapa, 
Mexico, having a pouch-like excrescence at the apex of its body. Mr. 
McLachlan, Mr. H. J. Elwes, and Mr. Poulton commented on it. 
Mr. C. J. Gahan communicated a paper entitled ‘‘ Additions to the 
Longicornia of Mexico and Central America, with notes on, some pre- 
viously recorded species.” Mr. W. L. Distant communicated a paper 
entitled ‘‘ Contributions to a knowledge of the Homopterous family 
Fulgoride.’’ Mr. Oswald Latter read a paper (which was illustrated 
by the Society’s new oxy-hydrogen lantern) entitled ‘‘ The Secretion 
of Potassium-Hydroxide by Dicranura vinula, and the emergence of 
the imago from the cocoon.”” The author stated that the imago pro- 
duced, probably from the mouth, a solution of caustic potash for the 
purpose of softening the cocoon. The solution was obtained for 
analysis by causing the moths to perforate artificial cocoons made of 
filter-paper. Prof. Meldola said that the larva of D. vinula secretes 
strong formic acid, and Mr. Latter had now shown that the imago 
secretes potassium-hydroxide, a strong alkali. He said he had long 
been familiar with the fact that the secretion from the imago of D. 
vinula was alkaline to test-paper, but he had never investigated its 
composition; and he also stated that the fact that any animal secreted 
a strong caustic alkali was a new one. Mr. Merrifield, Mr. Hanbury, 
Mr. Gahan, Mr. Poulton, and Prof. Meldola continued the discussion. 
Mr. H. J. Elwes and Mr. J. Edwards read a paper, also illustrated by 
the oxy-hydrogen lantern, entitled ‘‘ A revision of the genus Ypthima, 
principally founded on the form of the genitalia in the male sex.” 
Mr. McLachlan said he attached great importance to the genitalia as 
structural characters in determining species, and he believed that he 
