New York AGRICULTURAL EXPERIMENT STATION. 281 
Albion or Geneva. Some indications of the time of egg laying 
were given by the evident age of some of the larve found Octo- 
ber 29. An occasional one less than half grown was found, but 
most of them were full grown and a number had transformed 
to pupe. 
The mine-—The young larve feed upon the parenchyma usu- 
ally in the upper side of the leaf. The skin is left intact. The 
final result is a tentiform mine, which distorts the leaf as shown 
at Plate XX XIX, Fig. 4. In this mine the larva lives and feeds 
until full grown. Evidently no attempt is made to keep it clean, 
as the droppings were always found scattered about, as shown 
at Plate XX XIX, Fig. 2. This picture shows one of the mines 
cut open and much enlarged. 
When full grown they leave the old mine to prepare for pupa- 
tion. The manner of doing this is shown by a number of full 
erown caterpillars which were placed on fresh leaves in the 
laboratory October 31. They did not mine into the tissue, but 
selecting the slightly curled edges of the leaves and placing the 
body in a position nearly parallel to the side and far enough 
away so that by bending the anterior two-thirds of the body the 
head would touch the point of one of the serrations, begin to 
spin strands of silk from this point to the main body of the leaf. 
There were eight caterpillars, and all of them followed this plan. 
At Plate XL, Fig. 1, a single point is shown, much enlarged, 
held by the threads. The larvie worked very rapidly. In about 
half an hour most of them had made a network of silk extend- 
ing about half an inch along the sides of the leaves. They 
then began to work from the under side of the silk, and as 
they clung to it began to spin as before. Brunn‘ suggests that 
the weight of the caterpillar’s body causes the margin of the 
leaf to bend over. This undoubtedly has some effect, but as the 
caterpillars feed on the parenchyma, under the tent, the wither- 
ing tissues may play an important part in producing the desired 
result. In about three hours most of the tents had the appear- 

“Second Report Cornell Univ. Agr. Exp. Sta., p. 151, 
