Insects Bred from American Larch 25 
During July there was also evidence of the presence of a 
larvae of Monohammus, probably M. scutellatus, in the con- 
tinued casting out of the coarse “ sawdust” characteristic of 
this genus.* 
Tree No. X was a large tree about eighteen. inches 
D. B. H., which was not observed to be infested with insects 
in April, 1916, when. the material from most of the other 
trees was obtained. This tree had not been killed by strip- 
ping of the bark.. It stood in a rather moist situation in a 
dense part of the wood about fifty feet from Tree I. It had 
died from causes unknown probably late in 1915, or early 
in 1916. When examined in January, 1917, it still con- 
tained the brood of Polygraphus rufipennis and of Eccopto- 
gaster piceae, which must. have entered the bark during the 
summer of 1916. The wood was still quite sappy and con- 
tained resin pockets with the contents still unhardened. Also 
‘the bodies of several adults of H. piceae were found embedded 
by a copious flow of pitch in their egg galleries showing that 
the tree had been attact while still partly alive. 
A large part of the trunk of this tree from near the ground 
up to the very tip had had much of the bark removed by 
woodpeckers in search of the contained brood. Much of this 
barking had been done quite recently, for when the tree was 
found on January 5, 1917, the fresh chips covered the sur- 
face of the snow. The first samples from this tree were 
taken at this time. These, consisting of strips of the sap- 
wood with adherent bark, were brought in with the hope of 
breeding out specimens of Eccoptogaster piceae, the brood of 
which, together with that of Polygraphus rufipennis, were 
found in the trunk near the ground. In addition to these 
two scolytids, the larvae of Serropalpus barbatus was also 
* During the winter of 1917-18, this material was examined and 
found to contain living cerambycid larve. It was stored in a cool 
store room and in the following May and early in June gave rise to a 
number of specimens of Neoclytus longipes, a single Monohammus 
scutellatus, a single Chrysobothris dentipes, several specimens of 
Xylotrechus undulatus Say and to a number of hymenterais parasites 
which are apparently Odontaulacus bilobatus.. X. undulatus had not 
been previously bred from larch. 
