INSECTS INJURIOUS TO THE CHESTNUT. . oe 
the latter being scarcely longer than its body. The top of the head and the sides of 
the prothorax and under side of the body 
are covered with a pale-gray pile, while cer- 
tain silver markings on the wing-covers are 
composed of. similar close-set, fine hairs. The 
hairs on the sides of the prothorax inclose a 
conspicuous black spot, while the top is black, 
and more coarsely punctate than the wing- 
covers. The latter are each crossed by four 
acutely zigzag lines, composed of microscopic 
hairs, forming W-like bands on the elytra, the 
basal lines being less distinctly marked than 
the others. The ends of the wing-covers are 
also tipped with gray, especially on the inner 
side of the end. The legs are pitchy brown 
with light hairs, and with a reddish tinge on Fis. 40.—Chestnut Borer. —From Packard. 
the terminal joints (tarsi). It is a little over half an inch long. 
3. THE NOBLE CHESTNUT BORER. 
Calloides nobilis (Say). 
A longicorn borer, probably depredating upon the chestnut, and transforming to a 
large, handsome, black brown beetle, nearly an inch long, marked with three broken 
yellow lines and a pair of large round yellow dots on the wing-covers. 
Mr. George Hunt informs us that he has found this noble Clytus under 
the bark of the chestnut at Providence; hence it occurs as a borer of 
this tree. Its food-tree has not heret ofore been known. 
4. THE TWO-TOOTHED SILVANUS. 
Silvanus bidentatus (Fabricius). 
Order COLEOPTERA; family ATOMARIID2. 
Under the bark of logs and decaying trees, probably loosening the bark from the 
wood, a minute, narrow, flattened beetle, of a light chestnut-brown or rust-color, its 
thorax longer than wide, slightly narrowed towards its base and with a small tooth 
projecting outwards at each of its anterior angles. Length, 0.10to00.12inch. (Fitch.) 
Fitch observes that this is an European insect, which, like a kindred 
species, the Surinam Silvanus, has now become perfectly naturalized and 
as common throughout the United States as it is in its native haunts. 
On stripping the bark from recently cut logs of chestnut and of oak, 
this minute beetle, which is so flattened and thin that it can creep into 
the slightest crevices, will be found frequently in considerable numbers. 
The beetle.—The head and thorax often of a darker shade than the wing-covers ; the 
latter with rows of close punctures with a slightly elevated line between each alter- 
nate row. Its thorax also is densely and confluently punctured, and commonly shows 
a very faint elevated longitudinal line in its center. The angles at its base on each 
side are obtuse, and from these angles forward to the projecting tooth the latera] 
edges are crenate-dentate, having sixteen little elevated tubercles or minute teeth 
jutting ont at equal distances along the margin. The poinrt of the lage anterior tooth 
