502 SEVENTH REPORT OF THE FOREST, FISH AND GAME COMMISSION. 



work that their presence would scarcely be noticed, and the effect of tlieir work was 

 liardiy visible until the twig was almost completely destroyed. Upon close exami- 

 nation a delicate web was seen inclosing the base of the bud and the surrounding new 

 leaflets, resembling much the nest of a small spider. When this web was removed, 

 one or several little yellow caterpillars were seen either retreating into a mine 

 in the bud or into the bases of the leaves, which were also mined, or, not infre- 

 ([uently, they dropped from the twig, suspending themselves by a silken thread. 

 The bud was often so hollowed that it dropped to pieces almost at a touch. 



"At the time when they were first noticed larva; of almost all sizes were to be 

 found. Some were apparently almost full grown, while others had evidently not 

 been long hatched. The nearly full-grown specimens measured 8 mm (.31 inch) in 

 length. The first pupae were obtained early in June. Most of the larvae transformed 

 within the burrows which they had made, first spinning more or less of a silken 

 envelope about themselves. Others, however, issued from their mines, and spun 

 rather tough grayish cocoons between the leaves. The pupae were short, stout, and 

 brown in color, with each segment furnished dorsally with two serrated lines, one 

 consisting of large and the other fine teeth. 



"The first moths issued June 13, the pupce having previously worked their way, 

 by means of the spines just mentioned, into such positions that they could give 

 forth the moths without injury to the latter, and a few weeks later almost every 

 shoot had one or more of the empty pupal sl<ins protruding from it. 



" In the latter part of August, individuals of the second brood were very abun- 

 dant in the scrub-pine in the vicinity of Washington. As before, they were found in 

 almost every stage of growth, and the difference was even more marked. In one 

 instance five larvae of greatly differing sizes were found in one shoot. The smaller 

 ones were boring into the bases of the leaves, and the larger ones into the twig 

 proper. The largest of the five had made quite a long channel from the tip of the 

 bud down into the heart of the twig. Pupae were also found at this time, which did 

 not give forth the moth until late in the winter. 



" The usual mode of hibernation is in the pupa state. A thorough search in Jan- 

 uary in the field showed only pupae. The pupae collected in August and September 

 did not begin to give forth the moths in the breeding cages before early January, 

 though this was continued at intervals through January, February and March and 

 was greatly hastened without doubt by the heat of the room. On Februar\- 15, 

 however, a few twigs were collected, from one of which, on February 2.S, a full- 

 grown larva had emerged and was found crawling about the cage. This would 

 seem to indicate occasional larval hibernation." 



