38 College of Forestry 
The wood served as a breeding place for the curculionid 
Dryophthorus americanus, the cerambycid Leptura vittata 
and an unidentified elaterid. The larvee of L. vittata tunnels 
longitudinal burrows in the sapwood and outer heartwood 
thus hastening decay materially. From the same region of 
this punky wood adults of Dryophthorus americanus were 
removed the following fall (November 2, 1916). These 
had not appeared in the breeding cages during the summer 
but there was evidence that they had bred in ‘the wood two 
or more generations without change of host. 
Several specimens of the fly Phorbia fuscipes Lett. were 
also bred from this root. The larvee probably lived either 
under the decaying bark or in the punky wood as scavengers 
although they may possibly have been parasitic upon some 
of the other insect inhabitants. 
Our records also furnish data of several other species of 
insects from decaying wood or from wood dead several years. 
Tree V had been partly stripped of its bark several years 
before its death and the exposed wood had never been over- 
grown. This wood was well along in decay and contained 
the burrows of former insect inhabitants, probably Serropal- 
pus barbatus among others. In the field a single adult of 
Adelocera brevicornis was taken from this punky wood and 
in the breeding cage it gave rise to adults of the cossoninid 
Dryophthorus americanus and the tenebrionid, Tenebrio 
tenebriodes. Other specimens of Dryophthorus americanus 
were found under similar conditions in other trees and in 
the same sort of wood numerous specimens of another cos- 
soninid, Stenocellis brevis, were taken. 
The following tables will show something of the relations 
of these various insects to each other as well as something 
of their habits and the character of the material in which 
they breed. 
