. Elementary entomology . 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 trees.

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