STATE AGRICULTURAL SOCIETY. 
125 
PINE. TRUNK. 
to the grain of the wood, but curving, commonly, till they obtain 
a longitudinal direction. And from these numerous smaller 
and irregular wavy galleries branch off, at right angles or nearly 
so, and overspread the whole surface with a seemingly confused 
multitude of little furrows. The bark being quite thin in the 
young trees to which these beetles resort, their galleries are 
excavated mostly in the wood, the surface of which is deeply 
grooved whilst only a shallow impression is made on the inner 
surface of the bark. But at the end of each of the lateral 
galleries, a deep cavity will be noticed, sunk in the bark, in 
which cavities the insects repose during their pupa state. 
The accompanying figure of the tracks of these beetles hand¬ 
somely illustrates some of the facts which have already been 
stated above under the Wood-en¬ 
graver bark-beetle, and it may in¬ 
terest the reader to notice some of 
the habits of these insects as shown 
by this figure. In its upper half 
two leading galleries are seen run¬ 
ning parallel with each other and 
so near together that no adequate 
space exists between them for any 
young larvae to form their burrows 
there without encroaching upon each 
other or crossing the tracks already 
made. The parent beetles appear 
to have been aware of this and ac¬ 
cordingly so disposed of their eggs 
that all their young with but two or three exceptions mined 
outwards, traveling away from each other. Again, on the outer 
side of the left gallery two notches are observed, in which no 
eggs appear to have been placed, the parent beetle probably 
perceiving, wliat the figure indicates, that there was not suitable 
room to the left of these notches to duly accommodate all of the 
other larvae that would traverse that spot. Furthermore, it will 
be noticed that of the burrows leading off to the right, above 
the large knot or nuptial chamber, the worm which excavated 
the fourth one, soon after commencing his journey, perceived 
