THE CANADIAN ENTOMOLOGIST. 45 



the outside, for the simple reason, as it would seem, that the larva had no 

 while silk remaining to give the appearance usually seen upon the out- 

 side. I further observed that those which spun up immediately, without 

 wandering about much, make cocoons with the most complete silvery 

 bunches upon them. After the first long threads of the cocoons have 

 been extended, the larva moves its mouth back and forth for a consider- 

 able length of time in one place, as far as it can move its head, thus 

 depositing a large amount of the silvery silk in this place ; then moving 

 to another place, the same operation is performed, and so on over the 

 whole exposed parts of the cocoon. I did not see that they deposited any 

 of the silk in this way against the under surface of the glass when the 

 cocoon was placed against it. Nearly all of the cocoons which have been 

 found here were on the larch, and these silvery bunches certainly give 

 them a very close resemblance to the bark of that tree. 



Egg — Sub-globose, slightly compressed, the compression being least 

 upon the side from which the young escapes ; cream-colored, clouded with 

 reddish-brown, and attached to the object upon which the female deposits 

 by means of a dark brown adhesive substance, which appears to be the 

 same as that which is clouded over the surface of the egg, but the greater 

 abundance of it at the point of attachment produces a much darker color. 

 Greatest diameter, 2 mil. ; medium, ii mil. ; least diameter, 1? mil. The 

 eggs hatched in fourteen and fifteen days after they were deposited. 



Young Larva — Length immediately after escaping from the egg shell, 

 4 mil. Color black ; some of the individuals show a greenish tinge 

 around the base of the tubercles. Body cylindrical, slightly tapering 

 towards the posterior extremity ; head large, rounded, sparsely clothed 

 with long hairs. The second (first after the head), third, fourth, fifth and 

 sixth segments each with eight tubercles, the lowest one on each side 

 much smaller than the others. The seventh, eighth, ninth, tenth and 

 eleventh segments have each six tubercles, rather smaller than the cor- 

 responding ones on the preceding segments. The twelfth segment has 

 five tubercles, two on each side corresponding with those on the preceding 

 segment in size, and one on the middle of the dorsum of the same size as 

 the upper ones on the third segment. The thirteenth segment has four 

 tubercles on the anterior edge and one at the base of each anal proleg. 

 The tubercles are smooth, cylindrical, gradually enlarging towards the 

 base and at the summit, the least diameter being about two-thirds the way 

 up ; length equal to about three times the least diameter, surmounted with 



