THE CIGAR CASE-BEARER. 39 
SEASONAL HISTORY. 
In the early spring, as the buds begin to open, the minute larve 
free their cases (fig. 9, d@) from the branches where they have over- 
wintered, and begin to move about in search of food. Many of them 
reach the buds before these are opened, and eat into the soft inner 
tissues. By the time the leaves have begun to expand practically all 
of them have left their hibernating places and are actively feeding 
upon the delicate leaves. 
With the growth of the larve an addition is built to the case in the 
form of a tube. This extends from the anterior opening on the lower 
side of the case, and consists of fragments of leaves and silk. (See 
Lig 9.6.) 
Fletcher observed that occasionally a larva, on reviving in the 
spring, would leave its old case and make a new one, but as a rule the 
old case is detached from its winter resting place and is used for some 
time before a new one is made. 
Toward the middle of May the larva makes a case of an ates 
different appearance. After having undermined a sufficiently large 
area on the leaf, the larva abandons the old case, which usually re- 
mains attached to the leaf (Pl. II, fig. 3) and from the upper and 
lower skins of the leaf cuts out the future case. At first this is of an 
elongated, somewhat flattened shape, but as it becomes lined inside 
with silk it assumes a more cylindrical or cigar-shaped form. On 
close observation it will be found that one side of the case is of a 
hairy or woolly structure, while the opposite side is smooth. This is 
readily explained by the fact that the case is made from the upper 
and lower epidermis of the leaf, the lower surface being hairy and 
the upper practically smooth. In this case the larva will continue 
feeding for about one month. During that period it grows rapidly 
and consumes a relatively large amount of food. The injury caused 
at this time, though very extensive, is perhaps not more serious than 
in the early spring, when the opening buds are mutilated or killed 
by young larve. 
For some unknown reason it sometimes happens that a larva with 
a cigar-shaped case will abandon it and make a new one which is 
apparently similar in all respects to the one previously used. The 
writer has also observed larve transforming in the spring cases. 
This is probably owing to a lack of food, since these specimens, as a 
rule, seldom attained their full size. About the middle of June the 
larvee cease feeding and migrate from the leaves to the branches. 
The anterior end of the case is firmly fastened to the branch by means 
of silk, and a mass of silk is placed in the same end for the attach- 
ment of the cremaster of the future pupa. The larva turns around 
within the case before transforming, so that the head of the pupa is 
30490°—Bull. 80—12—4 
