720 
ANNUAL REPORT OF NEW-YORK 
PINK. TRUNK. 
galleries, however, end abruptly before they are half completed, 
the worm having been destroyed by insect enemies or some 
other casualty. And it is curious to notice how these little 
creatures respect the territory which is already in possession 
of another, changing their course to avoid any encroachment 
thereon; and if one of them finds himself so surrounded and 
hemmed in by other tracks that it becomes impossible for him 
to refrain from encountering them, he so shapes his course as to 
cross his neighbor's road as nearly as possible at right angles 
instead of obliquely, thus intruding thereon as little and for as 
short a time as possible. Sometimes also two females happen 
to excavate their galleries parallel with each other, and so near 
that no adequate space remains between them for their young 
to mine their burrows, the beetles having been unaware of their 
proximity, no doubt, until too much labor had been expended 
to admit either one to abandon the ground and go elsewhere. In 
such cases the eggs are all placed along the outer side of each 
gallery, and thus the larvse all mine their way outward in oppo¬ 
site directions to each other. 
The larva is a plump soft white worm, broadest anteriorly, 
and with its body bent into an arch or having its tail turned 
paitially inward under the breast. By transverse impressed 
lines it is divided into thirteen segments, the head being counted 
as one. Its head is polished and white, at least during the first 
periods of its life, with its maudibles chestnut brown, and no 
indications of eyes, and no feet, but with their places supplied 
by two small round retractile teat-like protuberances on the 
under side of each of the three segments next to the head. 
Having completed their growth, they sink themselves into the 
wood to repose during their pupa state. The small round hole 
which they perforate in the wood for this purpose, is seen at or 
near the outer end of each burrow in which tho worm has lived 
to reach maturity. 
Hie pupa resembles the perfect insect in its size and shape, 
with the rudimentary legs and wings enclosed in sheaths and 
appressed to the outer surface of its body in front. After tak¬ 
ing on its perfect form it perforates a small round hole through 
the bark and comes out from the tree. 
