138 MISC. PUBLICATION 273, U.S. DEPT. OF AGRICULTURE 



t.Wp 



Figure 61. — Stages and typical work of the mountain pine beetle (Dendroc- 

 tonus monticolae) : A, Eggs, greatly enlarged; B, larva; C, pupa; D, adult; 

 E, typical gallery; F, adults, pupae, and larvae. A-D, X 4; E and F, 

 natural size. 



