120 QUINCE SULTURE. 
Finding the larve every year on some of my quince 
trees, I have studied their habits with a great deal of in- 
terest. So far as 1 know, I am the first to prove that 
Fig. 106—THE POLYPHEMUS MOTH, FEMALE. 
they have two broods a year. Packard is certainly mis- 
taken when he speaks of ‘‘ our native species bearing but 
a single crop of worms,” for this one is double-brooded. 
The chrysalis that winters in the cocoon is proportion- 
ately short and thick, of a reddish brown, and distinctly 
Fig. 107.—THE POLYPHEMUS MOTH, MALE. 
marked in cylindrical rings. The larve of the first brood 
only pupate about twenty days, spinning their cocoons 
in June and July, according to the time they were 
