88 
COLEOPTERA. 
or excavated, was given to it by Mr. Say on account of the 
hollowed and bitten appearance of the end of its wing-covers. 
Its grubs eat zigzag and wavy passages, parallel to each other, 
between the bark and the wood. They are much less com¬ 
mon in the New England than in the Middle and Southern 
States, where they abound in the yellow pines. 
Another bark-beetle is found here, closely resembling the 
preceding, from which it differs chiefly in the inferiority of 
. „ its size, beins: but three twentieths of an inch in 
Fig. 43. ? . 
length, and in having only three or four teeth at 
the outer extremity of each wing-cover. It is the 
Tomicus Pini of Mr. Say (Fig. 43). The grubs 
of this insect are very injurious to pine-trees. I 
have found them under the bark of the white and 
pitch pine, and they have also been discovered in the larch. 
The beetles appear during the month of August. 
There is another small bark-beetle, the Tomicus liminaris^ 
of my Catalogue, which has been found, in great numbers, 
by ]\Iiss Morris, under the bark of peach-trees, affected with 
the disease called the yellows^ and hence supposed by her to 
be connected with this malady.* I have found it under 
the bark of a diseased elm; but have nothing more to offer, 
from my own observations, concerning its history, except 
that it completes its transformation in August and September. 
It is of a dark-brown color; the thorax is punctured, and 
the wing-covers are marked with deeply punctured furrows, 
and are beset with short hairs. It does not average one 
tenth of an inch in length. 
The pear-tree in New England has been found to be 
subject to a peculiar malady, which shows itself during mid¬ 
summer by the sudden withering of the leaves and fruit, and 
the discoloration of the bark of one or more of the limbs, 
[9 This species differs from the others known in this country by having the last 
three joints of the antennae dilated laterally, forming a lamellate club like that of 
the Scarabaeidae; it therefore belongs to the genus Phloiotribus. — Lec.] 
* See Miss Morris on the Yellows, in Downing’s Horticulturist, Vol. IV. p. 502. 
