THE GENUS DENDROCTONUS. 
117 
GENERATION. 
The eggs deposited by 
the overwintered broods 
of adults begin to hatch 
during the latter part of 
June (fig. 72) and the first 
part of July, and continue 
to hatch during July and 
August. The larval de- 
velopment is confined 
principally to July and 
August, but may con- 
tinue to October. The 
more advanced larvae 
begin to transform to 
pupae and adults during 
the last week in August 
and first week in Sep- 
tember, and continue to 
do so until hibernation 
begins in the fall. No 
evidence has been found 
that any of the broods 
emerge from the trees in 
the fall; therefore there 
is but one generation 
annually. By far the 
greater number of the 
broods pass the winter 
as young to matured 
adults, and the hiber- 
nation begins about the 
middle of October. 
HABITS. 
This species prefers to 
attack the older mature 
living timber. It also 
attacks standing tim- 
ber weakened or injured 
from other causes, and 
trees felled by storm 
and otherwise, though 
usually not in such 
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