* 



6 



Tills OA^'ADIAN IJNTOMi.ilJ M ;JST. 



structed of silk interwoven with the castings of the artificer, is Hned 

 internally with smooth, whitisli silk, externally it is rougher and of a yellow- 

 ish brown color. 



Within this curious structure there dwells a small caterpillar, which 

 during the winter months remains torpid, awakening to activity with the 



warmth of spring. As the leaves 

 of the apple tree begin to ex])and, 

 the larva draws those that are near- 

 est lo it towards the case, and feeds 

 on them, retreating quicklv within 

 its case when danger threatens. 

 When full grown it is about six- 

 tenths of an inch long, its body 

 tapering slightly towards the hinder 

 extremity. The head is dark red- 

 dish brown and the body dull green- 

 ish brown ; the next segment to the 

 head has a dark hovnv plate above 

 and a flattened blackish prominence 

 on each side. The head and an- 

 terior segments are shown at c in 

 the ligure. On each of the other 

 segments there are several small 

 black dots, from each of which arises a single pale brown hair. \Mien 

 mature, which is usually during the early part of June, it closes the end of 

 its case, and changes to a chrysalis within, about tour-tenths of an inch 

 long and of a reddish brown color, and in about a fortnight the moth 

 appears. 



\\'hen its wings are spread, the moth {d, figure 2) measures about 

 seven-tenths of an inch across. Its fore wings are ])a]e brown, with streaks 

 and patches of silvery white, the hind wings plain brownish white : the 

 under side of both wings ]ialer. I'here is only one brood in a year. 'J'he 

 moths deposit their eggs in the summer, and the larvii; construct their 

 cases and attain about one-third of their growth before winter sets in. 



Where these insects are abundant they become very injurious, consuming 

 the young growth as it expands and materially affecting the vigor of the 

 tree. To subdue them, pick the crumpled leaves with the cases from the 

 trees and destroy them. 



v\%. 



