734 
ANNUAL REPORT OF NEW-YORK 
PINE. TWIGS. 
it reaches the pith, in which it mines its burrow onwards a 
short distance farther, the whole length of its track being only 
about half an inch. But such a number of young weevils are 
usually placed in the affected shoots that many of them are 
cramped and discommoded for want of room.' The worm on 
approaching the pith often finds there is another worm there, 
occupying the very spot to which he wishes to penetrate. lie 
hereupon, to avoid intrusion upon his neighbor turns down¬ 
ward and completes his burrow in the wood outside of the pith. 
Those also which enter the pith are often unable to extend 
their galleries so far as is their custom without running into 
those of others. When its onward course is thus arrested the 
worm feeds upon the walls of its burrow, until it obtains 
the amount of nutriment 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 sum¬ 
mit 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 consequently 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 centre, so close in some places that their ends are in 
contact, and in other places more or 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 segments, 
including the head, with the breathing pores forming a row of small round 
tawny yellow dots along each side. Its head is about half tho width of the 
