INSECT ENEMIES OF WESTERN FORESTS 105 
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FicurE 52.—Long vertical egg galleries are characteristic of mountain pine beetle work. 
A clerid beetle (noc sclerus) , a fly (Medeterus), and a parasitic 
wasp (Coeloides) are the most active insect enemies. Woodpeckers 
also prey upon the species, and climatic conditions often are impor- 
tant as natural control agencies. 
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