54 
THE SCOLYTID BEETLES. 
from overwintered larvae may 'emerge during the period from August 
to October, but apparently the majority go over the second winter, 
together with a few larva 3 . Full-grown larva? observed by Mr. Webb 
on June 28 had not all transformed to adults on October 10, and 
only a few adults had emerged. The broods developing from the eggs 
deposited by the overwintered parent adults may develop to adults 
Fig. 16. — The roundheaded pine beetle: Egg galleries and larval mines. Reduce'! Author's 
illustration. 
before activity ceases in the fall, but the majority evidently pass the 
winter as medium to matured larvae. 
GENERATION. 
The overwintered broods of young adults begin to emerge and 
deposit eggs in June and continue to do so until September, or 
later. Some of the larvae from these eggs may transform to pupa? 
