( ‘xxxiv 4 
very feasible objects of attack; the black markings help to 
make them more conspicuous and to appear more projecting. 
When seized, large numbers of the hairs come out without 
injury to the larva, and with unpleasant consequences to the 
enemy. 
8. Protective resemblance of the larva of Geometra papilio- 
naria.—These larvee, which always feed on catkin-bearing 
trees, resemble catkins in colour, shape and attitude. Of 
twelve larvee in my possession the green ones spun first, and at 
the time when the catkins around were green ; the brown ones 
lived longer until they became brown. Greater numbers 
would be necessary to prove that this is invariable. The 
dimorphism is certainly of value, for if not, one form would 
very soon disappear. I have found by experiment that the 
moths from the green form produce a vast preponderance of 
green larve in the next generation. 
9. Defensive secretion of larve of Cresus varus. — The 
secretion was certainly acid; but its chemical nature could 
not be made out. 
10. Geometriform structure and attitude of the young larve 
of Euclidia mit.—The appearance of the larva was shown in a 
figure. 
Al. The determination of sex in certain living lepidopterous 
larve.—In all transparent larve the testes are distinctly 
visible as two lobate bodies side by side on the back of the 
fifth abdominal segment. They are generally brown or 
yellow in colour. They are especially distinct in the trans- 
parent larvee of Tortrices. 
November 7, 1888. 
Dr. Davin Suarp, F.L.S., F.Z.8., President, in the chair. 
Donations to the Library were announced and thanks voted 
to the respective donors. 
Election of Fellows. 
Mr. H. Stuart Fremlin, M.R.C.S., of Mereworth, Maid- 
