THE GENUS DENDKOCTONUS. 
103 
METHODS OF CONTROL. 
From what is known of the life history and habits it is evident that 
practically the same methods recommended for species 9 and 10 may 
be adopted for the successful control of this species. 
BASIS OF INFORMATION. 
Information on this species is based on investigations by Mr. H. E. 
Burke in July and August, 1906, along the rims of Little Yosemite 
and Yosemite, California, and*by Mr. V. S. Barber, at Sterling and 
Chester, Cal., in 1907. Additional localities through correspondence 
are Nevada City, Tallac, Pinogrande, and San Bernardino, Cal. 
This species is closely related to the 
mountain pine and Black Hills beetles, 
but is quite easily distinguished from 
them by the slightly more elongate, shin- 
ing, and finely punctured prothorax. ^ \|^ | 
B IBLI oo RA p H ;. _-^_: i 
Hopkins, 1909, pp. 114-116. 
No. 12. THE EASTERN LARCH BEETLE. 
(Dendroctonus simplex Lee. Figs. 62-64.) 
The eastern larch beetle is a stout, 
reddish to reddish-brown, cylindrical 
barkbeetle, 3.5 to 5 mm. in length, with 
broad, convex head, the prothorax short 
and strongly narrowed and constricted 
toward the head, the elytra with coarse 
rugosities between rows of indistinct 
punctures, the declivity convex and 
rather deeply grooved, the spaces be- 
tween rather convex, and the body sparsely clothed with rather long 
hairs. (See fig. 62.) It attacks injured, dying, felled, and living 
eastern larch, from New Brunswick, Canada, westward to northern 
Michigan, and probably to the western and northern limit of this 
tree, and south in the higher Alleghenies to northeastern West 
Virginia and western Maryland. It excavates long, slightly wind- 
ing egg galleries in the inner bark (fig. 63) and grooves the sur- 
face of the wood. The eggs are placed in alternate groups of 
three to six, or more, along the sides of the galleries. The short 
and broad, or sometimes long larval mines extend at right or oblique 
angles, and are exposed in the inner bark. The stout, whitish, grub- 
like larvae transform in separate cells at the ends of the burrows in 
Fig. 62.— The eastern larch beetle (Den- 
droctonus simplex): Adult. Greatly 
enlarged. (Author's illustration.) 
