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



Plate XXII. 



mh, 



u 



-■<& 



* . 



I 



H j ' 



1 











• 



..1 



M » 



■ 



kK 



(2 



Work of the Redwood Bark-beetle. 



a, Surface of wood grooved by primary galleries and larval mines: 5, bark with galleries and 

 mines through inner laver;' c. primary or egg gallery. ^From Bui. 38, Bureau of Forestry, 

 U. S. Dept. of Agriculture.) 



