THE GENUS DENDROCTONUS. 
137 
7.5 mm. in length, with the head broad and convex; the prothorax 
slightly narrower than elytra, its sides narrowed and slightly con- 
stricted toward the head, the surface even and shining, with coarse 
and small punctures intermixed; the elytra with moderately coarse 
rugosities between rows of moderately coarse and but slightly im- 
pressed rows of punctures, and the declivity smooth and shining in 
the female and less shining and more rugose in the male. It attacks 
felled white pine in northwestern Michigan. The primary or egg 
gallery is evidently of the same character as those of the spruce 
beetles, but the larval mines are probably like those of the European 
spruce beetle and the black and red turpentine beetles of this coun- 
try. The larvae resemble those of the eastern spruce beetle in the 
Fig. 
-The redwinged pine beetle: Distribution map. (Author's illustration.) 
dorsal plates on the last two abdominal segments, but are distin- 
guished by a row of brown spots (spiracles) on each side of the body, 
as in figure 87, B. 
SEASONAL HISTORY. 
This species evidently passes the winter in the adult and larval 
stages. Fully developed broods and larvae were found by Mr. W. F. 
Fiske, October 20, at Grand Island, Mich. Nothing further is 
known of the life history, but it is probable that it will not differ 
materially from that of the eastern spruce beetle. 
HABITS. 
Mr. Fiske found the developed broods under the bark on the 
underside of the trunk of a storm-felled white pine some distance 
from the base. Nothing further is known of the habits of this 
