102 THE CANADIAN ENTOMOLOGIST. 



stout at base, their tubercles shining black and meeting ; head rather 

 cordate, flattened in front, the vertices rounded ; black, shining ; the sur- 

 face much covered with black hairs. To next and last moult, in June and 

 July, 3 days. 



After Fourth Moult — Length .50 inch, color and spines as before, 

 but the band more definite. The larva grows rapidly and in three days 

 reaches maturity. 



Mature Larva — Length 1 inch ; cylindrical, slender ; color black- 

 brown, the under side greenish-brown ; along the base a broad band, 

 usually of dull green, with a yellow stripe in the line of lower lateral 

 spines, and a macular yellow line running with the spiracles ; in some 

 cases this band is wholly of ochre-yellow, or reddish-yellow ; the dorsum 

 and sides much dotted with white, coarsely and irregularly on the side, 

 but finely and mostly in regular transverse lines on dorsum ; the basal 

 band much dotted and spotted with yellowish, and these marks are found 

 also upon the under side ; spiracles black, round, in yellow rings, around 

 each a circle of yellow dots, and between each pair irregular clusters of 

 yellow dots and small spots ; body furnished with seven rows of long, 

 tapering black spines, one dorsal, three lateral on each side, each arising 

 from shining black tubercles, except those of the lower lateral row, which 

 have greenish or yellow tubercles, and each bristling with short, black 

 hairs ; those of third segment somewhat porrected ; on second a dorsal 

 collar of similar but smaller, bristling spines ; legs black, pro-legs yellow- 

 brown ; head cordate, vertices high and rounded, the front flattened, color 

 shining black ; much covered with black papillae, from which spring black 

 hairs. Duration of this stage 3 to 5 days. 



This is the history of such of the larvre as proceed to chrysalis and 

 imago the same season in which the eggs are laid, whatever may be the 

 brood of the year. But a portion of every brood, and of the larvae from 

 every laying of eggs, so far as experiment shows, behave quite differently, 

 and become lethargic and so pass the winter. The proportion of hyber- 

 nators in the June brood in this district (i. e., the first brood of the year 

 from egg) is about as 1 to 2, those which do not hybernate passing four 

 moults and reaching the imago in July. But after the first moult of the 

 brood is passed, a change takes place in the hybernators, and their devel- 

 opment and growth is retarded, so that when the regulars are passing their 

 third moult, these have but reached their second. And instead of being .24 



