Chapter XVIII. 
INSECTS INJURIOUS TO THE HEMLOCK AND LARCH. 
Abies canadensis. 
Dr. Fitch refers to the remarkable immunity of the hemlock from the 
attack of insects, yet it will be seen in the following pages that a num- 
ber of pests attack both the trunk and leaves ; still this tree is much 
freer from insect enemies than the spruce and fir. He states, however, 
that the porter Hylotrupes ( H. bajulus Linn. ) is reported to sometimes 
attack this fortunate tree, and that the larva of Fades imperialis is 
said to occasionally feed on it, as well as a bug. 
INJURING THE TRUNK. 
1. THE CANADIAN LEPTURA. 
Leptura canadensis Fabricius. 
Order Coleoptera ; family Cerambycid^e. 
Probably mining the trunk of the hemlock, a longicorn larva changing to a rather 
large handsome black beetle, with the black wing-cases deep red at the base, and an- 
tennae broadly ringed with reddish. 
Mr. George Hunt, of Providence, tells me that he has found the pupa 
of Leptura canadensis in the stumps of the hem- 
lock in July in the Adirondacks, ^New York. 
The beetle is rather a large one aud is black, the 
surface coarsely and densely punctured. It may 
readily be identified by the base of the wing- 
covers being deep red, while the antennse are 
broadly ringed with paler red, the joints in the 
middle being alternately red and black. It is 
three-quarters of an inch in length. 
2. A LARGE LONGICORN BORER. 
Order Coleoptera ; family Cerambycid.e. 
Mining under and loosening the bark of fallen hemlock 
logs near the Glen House, White Mountains, N. H., a large 
longicorn borer with the general appearance of Monoham- 
mus, but belonging to a different genus. Length of the 
different specimens from 7 to 17 mm . 
*-r 
V ..,-■■■'-: 
f 
T>^ 
<^r 
Fig. 297. 
-Leptura canadensis. 
Smith del. 
871 
