62 College of Forestry 
of these scolytids. Perhaps the association with Stenocellis 
brevis is the most common, due to the fact that their habits 
and food are similar. However, any actual relations which 
the two forms may have are doubtless accidental or casual. 
Stenocellis brevis Boh. 
Stenocellis brevis ranges from New England and Canada 
to Michigan and Kansas and south as far as Florida (Blateh- 
ley and Leng, 1916, pp. 545). This cossoninid has been 
taken from a great variety of host trees. Packard (1890) 
lists it from dead wood of elm (pp. 284), wood of butternut 
(pp. 342), partly rotten stump of red maple (pp. 391), 
and from linden (pp. 381). Chittenden (1890, pp. 99) in 
addition to these records it from basswood, beech, birch, syea- 
more and willow. Jlickory and poplar were added to the 
lst by Harrington (1896, p. 75). Felt (1906, pp. 494) 
adds ash, and Blatchley states that Zabriskie has found it in 
apple wood (1916, pp. 545). It has been taken by the 
authors from larch, hickory, apple and horsechestnut. No 
specific record has heretofore reported it from coniferous 
. woods so far as can be learned from the literature. 
From observations in the field as well as from literature 
on the subject it appears that decaying wood or at least 
exposed dead wood is necessary for the insect’s welfare. The 
burrows have been seen in apple and horsechestnut where 
the outer wood was still very hard and contained no evidence 
of fungi. In larch, however, it was found in one instance in 
the decayed wood of a small tree, about three inches in diam- 
eter, where the wood was soft and in such condition that the 
fibres could be readily pulverized between the fingers. In a 
second case they were taken from dead sapwood caused by 
the peeling of a strip of the bark down the trunk of a larch 
about fourteen inches in diameter. At this time both adults 
and larvae were found scattered through the galleries, the 
adults occasionally found in groups of three or four in 
enlarged chambers in the wood. The sapwood had begun to 
decay and the live bark had started to close over the wound, 
which had apparently been made about six years previously. 
