28 College of Forestry. 
which so great a quantity of pitch had exuded that the 
worker had been unable to dispose of it and had been em- 
bedded in it and killed. 
Still other burrows were found in which only the ends of 
the abdomen were visible, the rest of the beetle’s body being 
in the hole surrounded by pitch. ‘The most pitchy of these 
was chosen for study. When it was placed upon the stage 
ot the binocular microscope and the light condensed upon it, 
the pitch flowed even more freely than before, completely 
enveloping the body of the beetle. He backed part way out 
of the entrance and tried to free his body of the sticky liquid 
by violent movements of the legs and abdomen, at the same 
time opening and closing the space between elytra and abdo- 
men in an apparent endeavor to get air. For ten minutes he 
continued to work in his burrow covered with liquid pitch 
with only the end of his abdomen and elytra protruding and 
even these were often submerged momentarily. At the end 
of this time he backed out with only his head in the burrow 
and his body nearly parallel to the bark and kicked violently, 
trying to force the sticky pitch to one side. As the burrow 
was still full he backed entirely out and plunged violently 
back into it, repeating this a number of times. The harden- 
ing resin was forming a bank about the entrance making the 
burrow deeper and renderi ing it impossible for him to get to 
the bottom of the burrow without the body being completely 
submerged. After trying several times to resume work and 
being submerged each time, he backed entirely out of the hole 
and with his forelegs grasping the margin of the entrance, he 
sidled about half-way round the hole and in this way spread 
the adhering pitch to a distance of several millimeters. 
However, the burrow was still full of pitch and the speci- 
men after trying in vain to resume work, again backed out of 
the hole and leaving it entirely, sidled off kicking violently. 
He proceeded for a distance of 6 mm. spreading the pitch 
as he went, and then turned toward the burrow again. As 
he approached the entrance he came into contact with a small 
pile of frass and partly dried pitch and immediately paused 
and began “ rooting about”, apparently seeking the opening 
