Insects Bred from American Larch 67 
have been taken by the senior author at Cranberry Lake, 
N. Y., during June and early July, both on the wing and 
from the wood of both pine and hemlock. 
A. moestum is one of the primary insect enemies attack- 
ing the weakened tree. It is often associated in either its 
first year or second year with Serropalpus barbatus, which 
is also a wood inhabiting form. Quite often the burrows of 
these two forms occur in the same section of wood, although 
the melandryid, of course, bores the wood of a greater region 
of the trunk. Other beetles found to occur in the same 
samples of the trunk are Dendroctonus simplex, Polygraphus 
rufipennis, Hccoptogaster piceae (occasionally), Phymatodes 
dimidiatus and Melanophila fulvoguttata. These may be 
associated with A. moestum during either the first or second 
year of the latter’s life; or in the case of M. fulvoguttata, 
the two forms may occur in the same trunk throughout two 
years. It should be borne in mind, however, that A. moestum 
seldom or never spends any considerable time between the 
bark and the sapwood, and therefore its relations with these 
forms (other than S. barbatus) are usually more apparent 
than real. However, where it enters the tree a full season 
ahead of its associates, as often occurs, there can be no 
doubt that its presence in any considerable numbers greatly 
weakens the tree and makes this a more attractive host for 
those forms entering later. ‘This is especially true in the 
ease of the bark beetles because the larvee of Asemuwm, work- 
ing in the wood, while they weaken the tree’s resistance, do 
not destroy the inner bark. 
Monohammus scutellatus Say. 
Monohammus scutellatus is distributed throughout Canada 
and the Northern part of the United States from coast to 
coast, as far north as the Hudson Bay and Yukon regions 
(Hamilton, 1894, p. 31) and as far south as New Mexico 
and West Virginia (Hopkins, 1893, p. 195). 
The hosts most usually recorded for this cerambycid are 
white pine and spruce. In the Cranberry Lake region and 
