Bui 48. Div. of Entomology. U. S. Dept. of Agriculture. 



Plate XX. 



Mines of xHt Destructive Spruce Wood-borer. 



iSiirfncc of ihf wimkI of u •• pi-clrd " niul fcIU-ri stmici'. showing; mines, mitnml 

 size. ( From Kill. Jn, ii. s., I»iv. of Kiilomology. V. S. Dept. of .Vericiiltiire. ) 



