42 
THE FRUIT-TREE BARK-BEETLE. 
(Scolytus rugulosus Ratz.—tig. 40.) 
Small circular holes in the bark of fruit trees indicate this insect, 
known also as the ‘*peach bark-borer” or *‘shot-hole borer.” The 
Fig. 40.—Scolytus rugulosus: a, b, beetle; c, pupa; d, larva; all enlarged. (Chittenden.) 
adult insect, a tiny black beetle, appears in the latter part of March to 
the middle of May, and burrows through the bark. Between the bark 
and sapwood the female makes a burrow and lays her eggs along each 
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FIG, 41.—Amphicerus bicaudatus: a, beetle; b, pupa; ¢c, larva; d, winter burrow; e, larval gallery; f, 
work in grape. (Marlatt.) 
side. The young upon hatching bore away from the parental burrow, 
and in about three weeks are ready to pupate at the end of the gallery. 
