New York AGRICULTURAL EXPERIMENT STATION. 369 
to minute buckets with the covers on and without handles. The. 
shell is smooth and tough and the inside has a bluish tinge. 
The eggs are usually laid before the middle of July. It is not 
unusual to find them about Geneva before the tenth. Each fe- 
male deposits all of her eggs in one mass on any of the smaller 
twigs, forming a thimble which may or may not reach clear around | 
the twig. The eggs are placed on end close together, cemented 
and covered to the depth of about one-sixteenth of an inch by a 
thin frothy glue of a light brown color. This glue soon hardens 
into a tough but somewhat brittle covering, which has a brilliant 
surface. ‘The whole mass is somewhat oval, partly due to the 
fact that the eggs on the margins of the mass are placed in an in- 
clined position. 
The number of eggs in a single mass or thimble varies. The 
number is usually placed at from 150 to 250. A number of egg 
masses on peach and apple twigs examined by the writer contained 
on the average about 223 eggs each. At Plate XX XI, Fig. 1, two. 
egg masses are shown natural size. Fig. 2 shows one of the 
masses enlarged with the frothy covering removed to show arrange- 
ment of the eggs. Fig. 3 shows an old egg mass enlarged from 
which the caterpillars have escaped. 
Period of incubation.— As above stated the eggs are usually laid 
before the middle of July. The larve are fully formed within the 
eggs before or during the fall. The exact time was not observed 
but eggs examined early in November contained fully developed 
larve. The larve come forth early in the spring. In 1897 and 
again in 1898 eggs under the writer’s observation hatched about 
the middle of April. The period of incubation then, counting the 
time that the developed larve remain in the egg, is between 8 and 9 
months. 
The larva.— Last year in orchards about Geneva the young 
larve were hatching April 18. They were quite common and 
building nests 5 days later. The newly hatched larve measured 
1.7 mm, in length. They are dull black in color and are sparsely 
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