98 College of Forestry 
p. 27) from Arizona and (1910, p. 77) from Georgia, and 
by Blatchley (1910, p. 850) from Indiana. 
The most definite statement regarding the habits of this 
clerid is furnished by Hopkins (1893a, p. 185) when he lists 
it as predaceous and states that it occurs with Phleosinus 
dentatus in cedar bark. In larch it was found associated 
with the borers Polygraphus rufipennis, Phymatodes dimi- 
diatus and Leptostylus sex-guttatus, with the clerid Phyllo- 
benus dislocatus and with the parasites Rhyssa lineolata, 
Pseudorhyssa sp., Hurytoma sp., and several undescribed 
species of Doryctes. C. bicolor may be predaceous upon any 
of these but is more likely to feed habitually upon the scoly- 
tid P. rufipennis. It probably also acts as a scavenger in 
obtaining part of its food. 
Podabrus diadema Fab. 
The geographical range of Podabrus diadema is given by 
Adams (1909, p. 199) as Ottawa, Canada; Mt. Washing- 
ton, N. H.; Vermont; New York; New Jersey; Western 
Pennsylvania; Michigan; Wisconsin; Iowa. Smith (1909, 
p- 299) reports it from New Jersey. 
Nothing regarding the habits of this lampyrid was found 
in the literature but we believe that it acts as a predator’ 
and as a scavenger. Regarding the sister species P. regu- 
losus Blatchley (1900, p. 830) states that it “ Occurs on 
the leaves and flowers of various shrubs and herbs. One 
was noted feeding on a winged plant louse.” 
Only one specimen of this beetle was bred from larch. 
It emerged on June 15, 1916, from a section of the trunk 
of larch about thirty feet from the ground, infested heavily 
with the brood of P. rufipennis. The only other insects bred 
from this lot aside from the scolytid already mentioned were 
P. dislocatus and a small undetermined chalcid. It is likely 
that P. diadema inhabits the burrows of Polygraphus. 
