Insects Bred from American Larch 19 
From it were derived P. rufipennis, D. simplex, several 
specimens of Phyllobaenus dislocatus and two hymenop- 
tereous parasites,— a small undetermined chaleid and Spa- 
thius tomict,—these being parasitic upon the bark beetles. It 
is worthy of note that A. moestwm so numerous in the first 
segment and still present in the second is no longer found 
in this section beginning three feet above ground. 
In another cage was placed a portion of the trunk taken 
from 30 feet above ground. Burrows and specimens of P. 
rufipenmis were quite numerous but none of D. simplex 
occurred this far up. In the breeding cage this section of 
trunk yielded in addition to P. rufipennis, one specimen each 
of the clerid P. dislocatus, the lampyrid Podabrus diadema 
and a small undetermined chalcid. 
’ Another sample was taken of the trunk at its extreme tip 
about 50 feet above ground. P. rufipennis was taken from 
this in the field and the engravings were nearly as numerous 
proportionately as in other regions of the trunk (Fig. 2). 
No other insects came from this section of the tree in the 
cages although the bark shows exit holes of both cerambycids 
and buprestids. These had apparently emerged before the 
sample was placed in the breeding cage, showing that the 
tip of the tree had probably begun to die earlier than the 
lower part — this being in line with the conditions found in 
the lower branches where H. piceae was breeding and in the 
lower trunk which was still sappy in some parts. 
Numerous specimens of the limbs of this tree were taken. 
These are from 1 to 2 inches in diameter and are from a 
height of from 18 to 45 feet above ground. The bark upon 
these limbs is thin with only a small scaly and corky layer 
and was apparently quite dry and clung tightly to the wood. 
Some of the burrows in it, however, contained drops of resin 
showing that the bark had been attact while still sappy. 
In the field these samples yielded P. rufipennis and the 
larvae of a clerid, of a buprestid and of a small cerambycid. 
This material was kept out doors in two separate breeding 
cages (there being too much for one) during the summer 
till September 28, and the following insects emerged during 
