126 
THE SCOLYTID BEETLES. 
ard, 1887 (under B. rufipennis), pp. 176 and 243; Peck, 1890 (under D. rujipennis), pp. 
814-815, and 721-722; Harvey, 1898 (under D . rufipennis) , p. 176; Howard and Chitten- 
den, 1898 (under D. rufipennis), p. 98; Weed and Fiske, 1898 (under D. rufipennis), p. 
69; Hopkins, 1899a (under D. rufipennis), p. 293; Cary, 1900 (under D. polygraphus 
rufipennis), pp. 52-54; Hopkins, 1901a, p. 16; Hopkins, 1901&, pp. 68-69 ; Hopkins, 
19026, p. 21; Hopkins, 1902c, p. 22; Hopkins, 19036, pp. 266-270, 281; Hopkins, 1904, 
p. 26; Hopkins, 1905, pp. 10-11; Felt, 
1905, pp. 6, 7; Felt, 1906, pp. 379-385, 
782, 796; Hopkins, 1907, pp. 160-161; 
Hopkins, 1909, pp. 126-130. 
Xo. 
Fig. 78.— TheEngelmann spruce beetle (Dcndroctonus 
engelmanni) : Egg gallery in living bark. A. Normal; 
B, boring dust removed; a, entrance; b, basal sec- 
15. THE EXGELMANN 
SPRUCE BEETLE. 
(Dendroctonus engelmanni Hopk. 
Figs. 78-82.) 
The Engelmann spruce beetle 
is a reddish-brown to black 
barkbeetle, 5 to 7 mm. in 
length, with body sparsely 
clothed with long hairs, head 
broad and convex, prothorax 
sometimes darker than the ely- 
tra and with sides of pronotum 
distinctly narrowed and con- 
stricted toward the head and 
the punctures of irregular size 
and distinctly coarse, the ely- 
tra with coarse rugosities be- 
tween rows of indistinct but 
coarse punctures, and the de- 
clivity convex and somewhat 
flattened. It attacks the En- 
gelmann spruce, and probably 
other spruces, from central 
Idaho southward to the moun- 
tains of southern Xew Mexico, 
and the white spruce in the 
Black Hills of South Dakota. 
tion;c, boring dust packed in gallery; tf, subsequent -The galleries are Similar to 
or inner gallery; e, ventilating burrow; /, egg nest, 
with and without eggs; g, freshly hatched larv?e; 
h, pits in roof of gallery. (Author's illustration. ) 
those of the eastern spruce 
beetle. 
SEASONAL HISTORY 
OVERWINTERING STAGES. 
The broods of this beetle pass the winter in all stages of larva? and 
as adults in the inner bark of trees attacked by the parent beetles 
during the preceding summer. 
