Title: Bulletin
Identifier: bulletin8385190911unit (find matches)
Year: 1904 (1900s)
Authors: United States. Bureau of Entomology
Subjects: Insects; Insect pests; Entomology; Insects; Insect pests; Entomology
Publisher: Washington : G. P. O.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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154 THE SCOLYTID BEETLES. punctured, becoming finer toward base, the sides slightly narrowed toward the head, but not strongly constricted; the elytra with coarse, transverse to oblique rugosities between distinct to obscure rows of punctures; the declivity convex, with moderately deep grooves, and the intervening spaces slightly convex and roughened; the entire body sparsely clothed with long hairs. (See iig. 97.) It attacks the living bark on injured, dying, healthy, and felled pine and spruce in eastern United States and Canada, north from the mountains of North Car- olina, westward to the Pacific coast, and south- ward from British Co- lumbia into Mexico. The parent beetles excavate broad, somewhat irregu- lar, winding, longitudi- nal egg galleries (fig. 98) 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, yellowish- white, cylindrical larvae, with reddish heads and stout spines on the dorsal plates of the last ab- dominal segments, do not make separate larval mines, but all feed to- gether and eat out cavi- ties in the inner bark from a few inches square to Fig. 97.—The red turpentine beetle (Dendrodonus valens): several feet square (see Adult. Greatly enlarged. (Author'sillustration.) (Seealso n ggx They transform fig. 4, larva; fig. 5, pupa.) °* ^ to pupae and adults in separate or closely joined cells in the inner bark, or inner portion of the outer bark, or in mines extending from the social cham- ber. The broods work independently of other species and occupy and separate the bark around the base of trees and stumps (see fig. 99), often extending their work for a foot or more onto the roots beneath the surface, and the broad larval chambers are often filled with semiliquid resin, without injury to the occupants. The
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