PLATE IV. 
Bul. 32, New Series, Div. of Entomology, U. S. Dept. of Agriculture. 
Fic. 1.—A, PRIMARY GALLERIES, LARVAL MINES, PUPA CASES, 
AND EXIT HOLes; B, PRIMARY GALLERIES GROOVED IN SurR- 
FACE OF WOOD IN CHIP CUT FROM RAILROAD TIE. (ORIGI- 
NAL.) 
Fic. 2.—EVIDENCE OF CUTTING OF LIVING TREES. A, SCORING CHIP FROM 
RAILROAD TIE, SHOWING SURFACE OF WOOD NOT MARKED BY INSECTS; 
B, INNER SURFACE OF BARK FROM SAME CHIP. ABOUT ONE-THIRD 
NATURAL SIZE. (ORIGINAL.) 
