. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 11 ating g-alleries from a single entrance and a central chamber (fig. 2, a and Ij). The central chamber may (a), or may not (J), extend thi-ough the inner la^^ers of bark and groove the surface of the wood, but the radiating galleries are nearl}' always grooved in the surface of the wood, as are also the ^^^ cavities, which are excavated at short inter- vals along the sides (figs. 3 and 4). These grooved and notched carv- ings are often very conspicuous in the surface of the wood of trees and logs for many j'^ea
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 11 ating g-alleries from a single entrance and a central chamber (fig. 2, a and Ij). The central chamber may (a), or may not (J), extend thi-ough the inner la^^ers of bark and groove the surface of the wood, but the radiating galleries are nearl}' always grooved in the surface of the wood, as are also the ^^^ cavities, which are excavated at short inter- vals along the sides (figs. 3 and 4). These grooved and notched carv- ings are often very conspicuous in the surface of the wood of trees and logs for many j'^ears after the bark is removed or has fallen away. The number of galleries branching from the central chamber varies from two to five or six, but the normal number is four—two above and two below the entrance. The mode of development of the 3'oung stages is the same as in the pre- ceding species. (See PL V.) This is a -common enemy of the rock pine {Piruis jponderosa sco- IJuloy'um) throughout the Rocky Mountain region and of P. pan- el erosa west of the mountains. It is ever ready to attack and prevent the recovery of trees of all sizes which are sufieriug from weakened vital- ity. It is. also at- tracted to recently felled trees, and breeds in enormous numbers in the bark on the tops and branches. The species was found to be exceedingl}^ common in trees infested by the pine destroyer and on the logs and tops of those felled bv the lumbermen. The coarse-vypithig harh-beetle {Tomicus calligraphus Germ. var. occi- dentalis).—This is much larger than the Oregon Tomicus, but is of the same color and general form. Individuals vary in length from -i. 5 mm. to mm. This species also follows closely the first attack by the pine destroyer. It enters the bark from near the base to toward the. Fig. 3.—Work of the Oregon Tomicus. Primary galleries engraved in surface of wood. Central chamber not into wood except at a. Reduced about one-half (original).. Please note that
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