328 
ANNUAL REPORT OF NEW-YORK 
APPLE. TRUNK. 
diameter, whilst those of this insect measure 0.06. A specimen 
of the wood sent me, shows a perforation made by this larger 
insect, running in a straight line through the bark and into the 
wood three-fourths of an inch, with three lateral galleries of the 
same size branching off from this at right angles upon one side 
and one upon the opposite side, these galleries being excavated 
up and down parallel with the grain of the wood. 
It thus appears that the pear blight beetle, instead of being 
limited to the twigs in its operations, as has heretofore been sup¬ 
posed, attacks the trunk of the tree also. And it is therefore 
evident that there are two generations of this insect each year. 
The new shoots at the ends of the limbs are not sufficiently grown 
to accommodate the earliest brood, and they are therefore nurtur¬ 
ed in the trunk of the tree. When these reach maturity, the 
newly grown twigs offer them a more dainty repast, and they 
accordingly resort to them, blighting and destroying them in the 
manner hereafter stated in the account of this insect, No. 56. 
It was formerly supposed that the bark beetles only infested 
trees which were already dying or dead. But more recent obser¬ 
vations have shown that sound healthy trees are attacked and 
killed by them. And these observations are fully confirmed by 
Mr. Smith, who states that it is young thrifty apple trees, that 
made a most vigorous growth last summer, which have been 
killed this past spring by these insects. 
Worms consuming the wood of old and hollow trees, hastening their decay. 
The larvae of quite a number of beetles feed upon the old and 
decaying wood of almost all our trees, showing little preference 
for one tree over another. Those only which from their very 
large size will be liable to attract notice when found as they fre¬ 
quently are in the interior of aged apple trees, may here be speci¬ 
fied, although they are equally common in oaks, willows, &c. 
O. Horn-bug, Lucanus Capreolus, Linnaeus. (Coleoptcra. Lucanidao.) 
Large thick nearly cylindrical white worms, with the hind part 
of their bodies curved downwards and forwards, their heads and 
six legs tawny reddish, the mouth darker. In the loose dirt 
which accumulates in the hollow of the tree, forming large hard 
