42 
THE FRUIT-TREE BARK-BEETLE. 
(Scolyius rugvloms Ratz. — fig. 40.) 
Small circular holes in the bark of fruit trees indicate this insect, 
known also as the u peach bark-borer" or " shot-hole borer." The 
a led 
Fig. 40. — Scolytus r'ugulosus: 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 
Pig. 41. — Amphicerus bicaudatus: a, beetle; b, pupa: c, larva: d, winter burrow; e, larval gallery;/ 
work in grape. (Marlatt. i 
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. 
