Bui. 48 Diy. of Entomology, U. S Dept. of Agriculture. 



Platf. XIX. 





Galleries of the Spruce Bark-beetle. Showing Different Stages. 



a. h, .: Freshly i-xcaviin-cl kmIKH.-^ in living l,„rk; .1. ..I.I K.ilU'rii-s in .1,„,| l,„rk. , From Hul ■>» 

 u. s.. I»i\ . Ill Knri.nioli.gy. f. .x. l>fi>t. of .\Kriciiliurr. i ' ' 



