Exhibitions, dc. 
Mr. Dunning read the following letter received from the Rey. L. Jenyns, 
of Belmont, Bath :— 
“T see in the Proceedings of the Entomological Society (Part v. 1870, 
p- xxxiv.) notice of a communication, made at the Meeting of the 7th of 
November, respecting large swarms of flies, referred to Chlorops lineata, 
which had appeared in September in a room in the Provost's Lodge at 
King’s College, Cambridge. It may be worth drawing the attention of the 
Society to the circumstance of the same phenomenon having occurred, 
probably in the same room, in 1831, thirty-nme years ago, where it was 
witnessed by myself, the late Provost, Dr. Thackeray, having invited me to 
come in and see it. Of that phenomenon I published a full account at the 
time in Loudon’s ‘ Magazine of Natural History’ (vol. v. p. 302), and it was 
afterwards reprinted in my ‘Observations in Natural History’ (p. 275), 
published in 1846. 
“In reference to the occurrence of this fly in King’s College Lodge in 
September last, Prof. Westwood ‘ thought it was with a view to hybernation.’ 
This in itself seems not improbable; but the remarkable thing is, in this 
case, that the same house, if not the same room, should have been selected 
by this species of insect for the above purpose over a period of nearly forty 
years, during which time there must have been a succession of many 
generations. On the occasion of the swarms in 1831, it was about the 17th 
of September, so far as could be remembered, that these insects first 
showed themselves; and it was thought that they had entered the room 
very early in the morning, by a window looking due north, which had been 
open during part of the night, having been first observed between 8 and 
9 a.m. For further particulars I would refer those who are interested in 
the matter to my original notice of the phcenomenon.” 
Mr. Miller made some observations on the varieties of Ccoenonympha 
Satyrion, from the Gemmi, exhibited by Mr. Butler at the last Meeting. 
He had compared the specimens with those taken by himself in other parts 
of Switzerland, and with the descriptions given by Swiss authors, and found 
the species showed a considerable general tendency to variation. 
Mr. Verrall exhibited a dipterous insect, Pipiza noctiluca, taken by him- 
self at Rannoch, to the head of which was adhering a foreign substance, 
apparently a fungoid growth. Several members dissented from this 
explanation of the nature of the substance in question, and thought it was 
probably the pollen-mass of an orchid. 
Mr. Miller exhibited a gall on a species of Carex, concerning which he 
read the following notes :— 
“The present Lord Walsingham kindly sent to me, in the middle of 
September last, a growing plant of an undetermined species of Carex, 
