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 foUowiug 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. hajulus Linn. ) is reported to sometimes 

 attack this fortunate tree, and that the larva of Eacles imj^erialis 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 Cekambycid^. 



Probably mining the trunk of the hemlock, a longicorn larva changing to a rather 

 large handsome black beetle, with the black wing-casea 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 Leptnra canadensis in the stumps of the hem- 

 lock in July in the Adirondacks, i^ew York. 

 The beetle is rather a large one and is black, the 

 surface coarsely and densely punctured. It may 

 readily be identified by the base of the wiug- 

 covers being deep red, while the anteunpe 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^. 



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 pig^ 297.— Leptura canadensis. 

 different specimens from 7 to 17"™. Smitb del. 



871 



