ACCOUNT OF THE GENERAL AND ANNUAL MEETINGS. 173 
THE 457TH GENERAL, MEETING. 
October 5th, 1917. 
Exhibits of Natural History by the Members. 
The President, Mr. G. C. Griffiths, F.E.S., a collection of 
butterflies and moths, including the genus Psyche that pupates 
on St. Vincent's Rocks in numbers ; shells from Highcliffe clay, 
near Boscombe, Dorset. 
Miss Ida M. Roper, F.L.S., the orchid Helleborus atro-viridis 
and the hybrid Erigeron Hiilsenii, which has an annual com- 
posite for one of its parents ; both rare plants in England and 
new discoveries for this district. 
Mrs. Sandwith, dragon-flies, the Privet Hawk-moth, and living 
specimens of Cham and Utricularia. 
Mr. J. F. Knowlson, the nest of the Leaf-cutting Bee. 
Mr. J. W. White, F.L.S., three alien species of Panicum, 
found growing on refuse heaps in Bristol. 
Mr. L. H. Matthews, the bat Vesperugo pipistrellus, captured 
on the Mendips. 
Dr. O. V. Darbishire, the fungus Fomes igniarius, from near 
Bath. 
Mr. J. T. Kemp, M.A., told of the final destruction after its 
death of the oak tree at Shellard's Lane Farm, Alveston, Glos., 
mentioned by Knapp : "Journal of a Naturalist," 1829. 
THE 458TH GENERAL MEETING. 
" British White Butterflies and their Foreign Allies," by 
Mr. G. C. Griffiths, F.E.S. (President). 
The Pieridse or white butterflies have but few species in 
Britain, but they are representative of the divisions of the sub- 
family and very plentiful everywhere. There is, however, one 
species, Aporia cratcegi, which has completely disappeared since 
1868, and fresh introduction of it from the Continent has not 
been effective, although another species Pieris brassicce is yearly 
recruited by large migrations thence. The small white 
P. rapce is the most common, and this species has largely driven 
out the native species P. protodice, in America, where it has 
increased so as to become a pest, needing to be checked by a 
parasite from England. The pupa of this species varies for pro- 
tective colouration with the object on which it fastens. The 
other species of the family are strongly migrant, which causes 
much variation in their numbers year by year in Britain, and 
it is similar with their exotic allies. 
Exhibits by Miss Fryer of fresh flowers of Ornithgalum 
latifolium from the Cape, and dried specimens of Boronia from 
