Insects Bred from American Larch 61 
Dryophthorus americanus Bedel. 
The range of this cossoninid includes Eastern Canada and 
the Eastern United States as far south as Florida and as far 
west as Wisconsin. It has been reported as occurring specifi- 
eally in Pinus rigida (Chittenden, 1890, p. 172) and in 
general as being found under the bark and in decaying wood. 
(Insect Life, Vol. 1, p. 198.) 
Very little specific information can be culled from the 
literature regarding the habits and life history of this insect. 
Further than that the adults may be obtained from beneath 
the bark and in the dead wood (especially of pine) during 
the winter and early spring, no information seems to be at 
hand. Specimens were obtained by us from three separate 
lots of material. In one case under bark killed only the 
previous year and infested with D. simplex and P. rufi- 
pennis. ‘The small weevils perhaps fed upon the inner bark 
which as yet had only begun to decay. In both the other 
cases, exposed and decaying wood was the part infested (Figs. 
29, 30). Here the beetles were taken from their burrows, 
which ran in all directions through the punky wood, without 
conforming to any discoverable pattern. 
Adults were taken from breeding cages after emerging 
from their larval hosts July 3 and 7, 1916. Other speci- 
mens were taken from their burrows November 2, 1916. 
Insects obtained from the same material include Dryo- 
coetes americanus, Leptura vittata, Stenocellis brevis, 
Tenebrio tenebriodes, the elaterid Adelocera brevicornis, an 
unknown elaterid larva and the fly Phorbia fusciceps. Of 
the beetles mentioned all but Dryocetes americanus are wood- 
inhabiting forms and may bear very important relations to 
each other. The association with L. vittata and Dryocoetus 
americanus is perhaps not so common as with the other 
three beetles, though doubtless the larvae of the cerambycid 
prepare the wood for its later occupancy by the cossoninid. 
Its occurrence in the same bark with D. simplex and P. rufi- 
pennis is still less to be expected and perhaps may be 
explained by the individual of Dryophthorus americanus 
hibernating in the abandoned portion of the burrows of one 
