INSECTS INJURIOUS TO THE ROCKY MOUNTAIN SPRUCE. 243 
at Kelso’s Cabin, 11,200 feet elevation, on the road to Gray’s Peak. 
It bores into the bark and near the sap-wood in all directions, its bur- 
rows resembling those of Tomicus pini, with 2 9 
which it is associated, being irregular but 
much smaller. 
The larva is of the usual form of those of the family, 
being cylindrical and of the same thickness throughout, 
with the end of the body full and suddenly rounded; 
segments convex, especially the thoracic ones, and 
slightly hairy. Head two-thirds as wide as the body, sb eae eiprrareetgtiel se i ieee 
rounded, hone-yellow. Length, 0.15 inch. timber beetle.—From Packard. 
The pupa is much like that of T. pini, with two anal soft, sharp tubercles. As my 
specimens are farther advanced than those of 7. pini, the wings being free from the 
body, and the abdomen longer, it is impossible for me to draw up a good description. 
In one example the pupa had retained the larval head, but it was split behind so as 
not to interfere probably with the development of the adult beetle. 
The beetle differs from Tomicus pini in its much smaller and slightly slenderer body, 
The head and prothorax are two-thirds as long as the rest of the body. The abdo- 
men is not scooped out at the end as in 7. pini, but truncated, moderately rounded, 
and the end of the abdomen reaches to the end of the wing-covers, which are square 
at the end instead of excavated as in 7. pini. Color reddish-brown, much as in 7: 
pini. The body is covered with fine, stiff, straight hairs. Length, 0.14. (Packard in 
Hayden’s Report for 1875. 
This insect is said by Leconte to occur in the Lake Superior region, 
British Columbia, and Alaska. 
2. THE PINE TIMBER BEETLE. 
Tomicus pini Say. 
This insect, already described on page 168, is common in the timber 
region of the Rocky Mountains, boring irregularly into the inner bark 
of Abies menziesii. The burrows are like those made by the same insect 
in the white pines of New England. The main burrows of the mines 
observed in Colorado were 0.08 inch in diameter. 
3. THE COMMON LARGE RED TIMBER BEETLE. 
Dendroctonus rufipennis Kirby. 
This beetle, so common in Maine and British America, is also common 
in the coniferous trees of the mountains of Colorado, where I have met 
with it at Blackhawk and at Manitou. 
° 
4. THE LARGE TIMBER BEETLE. 
Dendroctonus terebrans (Olivier). 
This common eastern form, which occurs from Maine to Georgia, and 
in California and Oregon, also probably infests the pine and spruce of 
elevated regions. I have a specimen from Tacoma, Washington Ter- 
ritory, on Puget Sound, a lumbering place, which was identified by Dr. 
G. H. Horn. 
