Practical Information On the Scolytid Beetles of North American Forests
Practical Information On the Scolytid Beetles of North American Forests
Andrew Delmar Hopkins
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The parent beetles excavate broad, somewhat irregular, winding,- longitudinal or sometimes transverse egg galleries through the inner bark and groove the surface of the wood. The eggs are placed in groups or masses at intervals along the sides of the galleries. The stout, yel- lowish-white, cylindrical larvae, with reddish heads and stout spines Digitized by Google THE GENUS DENDROCTONUS. 147 on the dorsal plates of the last abdominal segments, do not make separate larval mines, but all feed to...gether and eat out cavities in the inner bark from a few inches square to several feet square. They transform to pupae and adults in separate or closely-joined cells in the inner bark or inner portion of the outer bark, but a few of the larvae sometimes excavate independent mines beyond the social chamber for the purpose of pupating. The broods work independently of other species and occupy and separate the bark aroimd the base of trees and stumps, often extending their work for a foot or more under the bark onto the roots beneath the surface.
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