t ‘ a. “ 
3 INSECTS INJURIOUS TO THE PINE. 187 
upon the walls of its burrow until it obtains the amount of ere 
it requires and is grown to its full size. 
The tree that is attacked continues its growth upward during the fore 
part of the season as usual, sending out from the summit of the shoot 
that is infested a leading shoot, with a number of lateral branches 
around its base. But the growth of these new succulent twigs is arrested, 
and they begin to wilt and wither about the middle of July, the worms 
“having by this time become so large and mined and wounded the stalk 
below to such an extent that its juices are exhausted, and it fails to 
transmit any nourishment to these tender green shoots at the summit, 
which conseqnently dry up and perish. 
If the affected shoot be now examined, little oval cells about 0.30 
long, placed lengthwise of the stalk, will be discovered all along its 
center, so close in some places that their ends are in contact, and in 
other places moreor less widely separated, with the intervening space 
stuffed with sawdust, whilst here and there in the wood on each side 
of the pith similar cells show themselves. In each of these cavities lies 
a white glossy worm, its body soft, plump, and curved into an arch, 0.30 
long, and not quite a third as broad at its anterior part where it is 
broadest. 
This larva is divided by transverse constrictions into thirteen seg- 
ments, including the head, with the breathing pores forming a row of 
small round tawny yellow dots along each side. Its head is about haif 
the width of the body, round, flattened, polished and horn like, tawny 
yellow, with an impressed line along its middle, a faint whitish line on 
each side parallel with this, and a more distinct transverse arched white 
line anteriorly, and a minute black dot on each side representing 
the eye; the mouth darker colored, with the points of the mandibles 
slightly projecting, these organs being black, triangular, and with 
exceedingly minute sharp teeth along their inner edge. The neck has 
two smooth pale tawny-yellow spots above. It has no feet, but their 
places are supplied by roundish elevations of the skin on the under side 
of the three segments next to the head. The surface shows a few very 
fine short hairs, particularly on the ends. 
These larve change to pup and to perfect insects in their cells, the 
latter coming abroad mostly early in the spring. The short description at 
the commencement of this account will suffice to distinguish this weevil 
from all our other species. It varies in its length from 0.20 to 0.30. Dr. 
Harris thinks they are more than a year in obtaining their growth, but 
Iam quite confident the eggs deposited in the spring become mature 
beetles by the following spring or earlier. 
In midsummer, as soon as the shoot in which these insects are nest- 
ling becomes withered and dry, the thin bark covering it is commonly 
seen to be broken and peeled off in spots, or all its lower part is torn 
away, and newly perforated holes, larger than the miouths of the burrows 
of this insect, may be observed here and there in the weod. This is 
