granulated appearance. The egg galleries are generally 

 clear of sawdust.' The adult "beetles use them as runways. 

 The depredations of this beetle are confined to trees or 

 parts of trees with thin "bark. Except in the case of down 

 logs, the attacks are confined in living timber to the 

 young trees with thin bark, and the upper part of the crown 

 where the bark is also thin. In connection with the ab^ve 

 habit, it may also be distingiiished by the five spines, and 

 the absence of sawdust in the galleries. 



MSLAKQPHILA GSNTILIS, LEG. 

 (The Pine Plat head Borer.) 

 Hosts - All pines. 



This flathead is cornnon in all pines with prob- 

 ably the exception of lodgepole pine. 



S''uth of Kern Siver it is often primary in caus- 

 ing the death of mature sugar, Jeffrey and yellow pines. 

 The adult beetle which is bright bluish-green, about one-half 

 an inch in length, may offen be seen on hot days running over 

 the trunks of dying trees. The eggs are laid in crevices of 

 the bark, from which the larvae on hatching bore into I; he 

 inner bark and construct winding, irregular galleries of no 

 regular design, which increase in size with the growth of the 

 larvae. On reaching its ftill growth the grub bores into the 



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