26 College of Forestry 
taken in the field from near the base of the tree. In the 
breeding jar these chips gave rise to specimens of P. rufipen- 
nis, E. piceae, the predator Phyllobaenus dislocatus and the 
parasite Phasgonophora sp. 
On February 26 this tree was felled and samples were 
taken from the trunk at various levels. The first section was 
taken from about eight feet above ground and gave rise to the 
following insects when placed in the breeding cages. The 
two seolytids Polygraphus rufipennis and Eccoptogaster piceae 
with the hymenopterous parasites Rhyssa lineolata, Doryctes 
sp. a., Spintherus pulchripennis, Spathius tomici, Spathvus 
sp., an undetermined pteromalid and the parasitic fly Mede- 
terus sp.; the predator Phyllobaenus dislocatus, which preys 
indiscriminately upon all scolytids and upon other small 
bark-boring insects; the cerambycid Phymatodes dimidiatus, 
which was parasitized by Doryctes sp. and Rhyssa lineolata ; 
the melandryid, Serropalpus barbatus; and the siricids Uro-- 
cerus albicornis and Sirex abbotii. Examination of the base 
of this tree in the field showed numerous larvae of Asemum 
moestum. 
A second section of the trunk taken about twenty feet from 
the base of the tree yielded exactly the same association of 
insects. A. moestum is of course missing just as at the eight- 
foot level. This form, as we have already seen, is one attack- 
ing only the basal part of the tree trunk and has not been 
found higher than a few feet from the ground. 
The third region of the trunk included all of it above a 
point thirty feet from the ground and consisted of six pieces 
each a little less than two feet long. The insects taken from 
this material included the two scolytids and their parasites 
and predators as in the lower trunk, Serropalpus barbatus 
and Urocerus albicornis. 
Tree No. XI was a small tree of about three inches 
D. B. H. which had been killed several years before (prob- 
ably 1913) by shading. The wood was partly decayed by 
a “dry rot” and contained numerous specimens of the cur- 
eulionid Stenocellis brevis. The wood was in such condition 
February 26, 1917, that it could be easily pulverized between 
