of Kern River. In lodgepole pine it also kills a large per- 

 centage of the infested trees. Mountain pines occasionally 

 die from its attacks and a small percentage of yellow pines, 

 especially those near sugar pines similarly infested. The 

 adiilt or egg galleries may "be found in the inner bark. Them 

 galleries are filled with pitchy sawdust and are nearly al- 

 ways vertical. The eggc are laid near the sides of the gal- 

 lery and the grub or larvae on hatching excavate small gal- 

 leries radiating from the main gallery and terminating in a 

 cell where the change to the adult takes place. Peeling the 







bark will expose the larvae, ^upae, and adults as they are 

 alwa3^s found in the inner layers of the bark. 



This species may be told by the vertical galleries, 

 by the larval galleries being all in the inner bark, and by 

 the very few exit holes which are considerably larger than 

 those of the preceding species. The beetle is black, but 

 somewhat larger than Pendroctomis brevicomis in jrellrw pine. 

 Outside of Pendroctonus valens, which attacks the br.ses of 

 all species of pines, this beetle is the only Dendroctonus 

 attacking sugar and lodgepole pines, which kills them cut - 

 right. Cull logs or butts of sugar pine left in the woods 

 generally breed this species. 



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