18 College of Forestry 
den April 29, 1916, while the rest was obtained later, at 
various times, as indicated. 
Tree No. I was a large larch of about 14 inches D. B. H. 
and about 50 feet high. It had probably died late in 1914 
from unknown causes as it had not been stripped of its bark. 
It was the one tree found in the spring of 1916 which con- 
tained living specimens of Dendroctonus simplex. The lower 
part apparently had survived longer than the branches as the 
lower trunk was still somewhat sappy. This tree was rather 
interesting from the fact that a large part of the bark from the 
ground to the tip had been removed by woodpeckers in search 
of various bark boring insects. Under the portions of bark 
still adhering many specimens of Polygraphus rufipennis 
and Dendroctonus simplex still remained, but it needed only 
a casual examination of the bark to discover that a very 
large percentage had been uncovered and destroyed by the 
birds. 
More material was taken from this tree than from any 
other one source. In one cage was placed the first segment 
of the trunk, the lower end of which was taken from only 6 
inches above ground. The bark on this section was riddled 
by the burrows of D. simplex and P. rufipennis and the sap- 
wood contained many larvae of Asemum moestum. These 
latter were so numerous that just above the root 6 larvae 
were taken from an area of the wood only 6 inches square. 
In addition to these, three other species were bred from this 
section of the tree: the buprested Melanophila fulvoguttata, 
the weevil Dryophthorus americanus, and a small fly Pol- 
lema rudis. 
In another cage was placed the next section of the trunk 
taken from 18 inches above ground. In the field D. simplez, 
P. rufipennis and the larva of a clerid, apparently Phyllo- 
benus dislocatus, and of a cerambycid, Asemum moestum, 
were taken. The adults of all of these and in addition of 
Serropalpus barbatus were bred from this wood. 
In another cage was placed a section of the trunk from 3 
feet above ground, this and the two pieces already described 
having been continuous and forming the base of the tree. 
