722 
ANNUAL REPORT OF NEW-YORK 
PINE. TRUNK. 
species, in which the eggs are deposited; hut the lateral bur¬ 
row's which branch from the central one have no regularity 
whatever to them, being given off sometimes obliquely and 
sometimes at right angles, sometimes abruptly widening into a 
broad irregular flat cavity, and sometimes continuing of the 
samo width through their whole length, either straight, irregu¬ 
larly w'avy or tortuous, turning here and there, wherever an 
unoccupied space occurs into which they can be extended. 
These branches are usually of the same width v'ith the central 
gallery, and like it are furrowed equally deep in the outer sur¬ 
face of the w T ood and the inner surface of the bark. The pupa 
state is passed in a cell excavated in the bark, and not in the 
w'ood, as in the foregoing species, and when changed into a 
beetle this cell is extended onwards through the bark for the 
escape of the insect. Being a larger species than the preceding 
the galleries which it excavates, and the holes it perforates 
through the bark, are proportionally larger. Several dead in¬ 
dividuals may usually be found in the galleries of this as of the 
other species. 
244. Pine bark-beetle, Tomicus Pini, Say. 
From a common centre excavating several broad shortish gal¬ 
leries lengthwise of the trunk in opposite directions, resembling 
the spread fingers of a hand ; a bark-beetle very similar to the 
preceding but of a smaller size, measuring only 0.15 in length, 
and with but four small teeth on each side of the concave de¬ 
clivity at the tips of its wing covers, and usually showing more 
or less distinctly an impressed line along the middle of the hind 
part of its thorax. 
The tracks formed by this insect are so different from those 
of the other species that they are recognised at a glance. They 
occur under the bark of old trees of the white pine, and have 
some resemblance to the fingers of a hand spread apart, or to 
the track of a bird. From a common centre they run off in op¬ 
posite directions up and down the tree, lengthwise of the grain, 
mdderately diverging or nearly parallel with each other, appear¬ 
ing, when the bark is stripped off, like linear grooves in the 
outer surface of the wood and inner surface of the bark. They 
