. Elementary entomology. Insects. 170 ELEMENTARY ENTOMOLOGY small, slender, brown weevils, one eighth of an inch long, which are the most abundant pests of granaries. The engraver-beetles (ScolytidctR), or bark-beetles, live on the inner bark and sapwood of forest and fruit trees, the larvae of each brood tunneling out their little burrows in characteristic patterns, giving them the name of '; They are small brown or blackish beetles, often microscopic, rarely over one eighth and never over one fourth of an inch long, and with the head very slightly produced, so that they are no
. Elementary entomology. Insects. 170 ELEMENTARY ENTOMOLOGY small, slender, brown weevils, one eighth of an inch long, which are the most abundant pests of granaries. The engraver-beetles (ScolytidctR), or bark-beetles, live on the inner bark and sapwood of forest and fruit trees, the larvae of each brood tunneling out their little burrows in characteristic patterns, giving them the name of '; They are small brown or blackish beetles, often microscopic, rarely over one eighth and never over one fourth of an inch long, and with the head very slightly produced, so that they are not readily recognized as snout- beetles. They have stout, cylin- drical bodies, obliquely or squarely truncate at the tip. The larvae are little white grubs, with brown heads and strong jaws, which riddle the inner bark of the food plant and pupate in the burrows. When the adults emerge, they make numerous small holes through the bark, which habit has given them the name of ' shot-hole ; This family includes the most de- structive of all our forest insects, the losses due to them being es- timated at over one hundred million dollars per annum. Almost every tree has species which commonly attack it in different sections of the country, some infesting only sick or dead timber, while others. FIG. 256. Typical woric of a scolytid, the fruit-tree bark-beetle, showing the main galleries, the side or larval galleries, and the pupal cells. (Slightly enlarged) (After Ratzeburg) attack the healthy trees and sweep them off over large areas, the trees dying and giving rise to forest fires. The fruit-tree bark- beetle (Scolytns rugulosus] is a well-known example, infesting our common fruit Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Sanderson, Dwight, 1878-1944; Jackson, C. F. (Cicero Floyd), b. 18
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