6 
Feb. 7th, 1905.— Cerapteryx graminis. —Mr. W. J. Kaye, a series 
taken in September, 1904, by searching the grass at night in Richmond 
Park. 
Misosemia eumeni.— Mr. Kaye also exhibited a specimen of this 
butterfly from British Guiana, set in its resting position, to show its 
resemblance to the bead of a mouse. 
Plusia gamma, dwarfed.— Mr. E. A. Cockayne, four very small 
specimens bred from larvae found on Goosefoot. 
Genus Perizoma.— Mr. L. B. Prout exhibited specimens of all the 
British species of Perizoma. 
Paper. —Mr. L. B. Prout read his paper entitled The British 
species of the genus Perizoma (=Emmelesia),” which is printed “ in 
extenso ” at the end of this volume. 
Feb. 21st, 1905.— Donation.— Dr. T. A. Chapman presented to the 
Society a bound collection of his writings on Entomological subjects, 
printed since 1870. 
Change of Secretaries. —Mr. W. J. Kaye, having announced his 
intention of adhering to his decision to resign, Mr. S. J. Bell consented 
to fill his place as Reporting Secretary, while Mr. E. Harris was 
appointed to the vacancy thus created as Corresponding Secretary. 
Melanic lepidoptera from Sheffield. —Mr. E. A. Cockayne, a box 
of insects taken within five miles of Sheffield, including Polio cln var. 
olivacea, and melanic forms of M. multistrigaria, (i. gothica, P. cheno- 
podiata and 11. furcata. 
Cidaria immanata.— Mr. W. J. Kaye, a series from Oxshott taken 
in July, 1904, when the insect was abundant in this locality. 
Leucania favicolor and L. pallens. —Mr. A. M . Mera, on behalf 
of Rev. C. R. N. Burrows, red and putty coloured forms of both species, 
pointing to parallel variation. 
Hybrid N. ziczac and N. dromedarius.— A single specimen of 
this hybrid.— Ibid. 
Discussion on The Numerical Flucuation of Lepidoptera. —Mr. 
W. J. Kaye, in opening a discussion on this subject referred to the 
various conditions that may give rise to abundance or scarcity, and 
dwelt particularly on the influence of ichneumons and the lying over 
of the pupa? of certain species; the migration of the host without the 
parasite and varying climatic conditions were also alluded to. It was 
obvious that the parasite did not everywhere occur in the same 
proportion ; in London for instance T. psi and A. aceris larvae were 
nearly always found to be “ stung,” while in the country the reverse 
was the case. 
Mr. L. B. Prout pointed out that the abundance of one species may 
jeopardise the existence of another, and instanced the stripping of the 
blackthorn in Epping Forest by larvae of E. defoliaria, thus depriving 
later species of food. Many other members also contributed to the 
discussion. 
Perizoma unifasciata four winters in pupa. —Mr. L. B. Prout 
stated that he had in his possession two live pupae from larvae that 
“ went down.” in 1901. 
Early appearance of Graphiphora stabilis. —Mr. A. E. Tonge 
recorded the capture of this insect at Redhill on February 20th. 
