. Insect pests of farm, garden and orchard . a he d Fig. 396,—The fruit-tree bark-beetle (Scolytus mgvlosus): a, b, beetle; c,pupa; d, larva—enlarged, (.\fter Chittenden, U. S. Dept. Agr.) gallery or brood chamljer, along the sides of which at short inter-vals she gnaws out little pockets in which she places her larvie hatching from these eggs excavate little side galleries,which branch out and widen as the larva? increase in size (). The larvae become mature in about three weeks, when theyform cells at the ends of their burrows and transform to pupae,from which the adult beetl
. Insect pests of farm, garden and orchard . a he d Fig. 396,—The fruit-tree bark-beetle (Scolytus mgvlosus): a, b, beetle; c,pupa; d, larva—enlarged, (.\fter Chittenden, U. S. Dept. Agr.) gallery or brood chamljer, along the sides of which at short inter-vals she gnaws out little pockets in which she places her larvie hatching from these eggs excavate little side galleries,which branch out and widen as the larva? increase in size (). The larvae become mature in about three weeks, when theyform cells at the ends of their burrows and transform to pupae,from which the adult beetles emerge about a week later. Thereare probably three generations a year in the Middle States accord-ing to Dr. Chittenden. Were it not for the effective work of parasitic and predaceousinsects which prey upon it, this insect would be a most seriouspest. One of the most valuable of these is a little chalcis-fly * * Chiropnchis colon Linn. 546 INSECT PESTS OF FARM, GARDEN AND ORCHARD of which Dr. Chittenden bred 92 specimens from 72 of t
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