134 THE CANADIAN ENTOMOLOGIST. 



3 sometimes at a single scar." The junior author has frequently 

 found the eggs under natural conditions near the tips of the branches 

 of Aspen Poplar, the place selected being the scar left by the fallen 

 leaves of the pre\ious autumn. Oviposition has been noted high 

 up among the terminal twigs of trees, thirty feet or more in height; 

 at other times the female moths were observed to choose a tree 

 of about five feet in height. As a rule, not more than one egg is 

 deposited on a leaf scar. From close observation, made on three 

 occasions, a single female moth undoubtedly deposits several eggs 

 on the same tree. In one instance the junior author noticed a 

 female visiting at least a do/.en different situations on the same 

 tree for the purpose of oviposition. The largest number of eggs 

 obtained from a single female was 135. This indi\idual was 

 collected at Aweme, Man., on 14th April, 1903, and in confinement 

 continued ovipositing for six days. 



The eggs^which were deposited at Midnapore, Alta,. on April 

 5-10, mostly hatched at Ottawa, on April 21 and 22. 



Descrii TiON OF Larval Stage. 



First Instar. — -The newly-hatched larva is 2.0 mm. in length 

 and dark-green in colour. Head 0.3 mm. wide, rounded, some- 

 what quadrate, darker than body, of a greenish-brown shade, 

 margined posteriorly with brown; ocelli black. No markings on 

 body; lateral area and dorsum of first thoracic segment, paler. 

 Tubercles pale brownish, indistinct, circled with sordid whitish; 

 setae short, stiff, \er\' conspicuous. Spiracles brown. First three 

 pairs of prolegs aborted. Feet concolorbus with body. After 

 feeding, the larva is of a greenish-gray colour. 



Second Instar. — Length 5.5 mm. Head 0.6 mm. wide, greenish- 

 W'hite, with dark green blotches, particularly on cheeks; ocelli 

 black; mandibles pale reddish. Body marked longitudinally with 

 pale white stripes as follows : addorsal stripe; subdorsal stripe 

 wider than addorsal stripe; lateral stripe, just above tubercle iii; 

 wide stigmatal band enclosing tubercles iv and v (the skin here is 

 conspicuously wrinkled) ; and a rather indistinct medio-ventral 

 stripe. Ventral surface distinctly glaucous. Tubercles brown. 

 Spiracles dark brown, white in centre. Prolegs concolorous with 

 venter. As the stage advances the skin of dorsum, particularly 



