THE GENUS DENDROCTONUS. 



13 



and both the pupal cells and larval mines are exposed in the inner 

 bark. 



In species 12 to 23, so far as observed, the egg galleries are longitu- 

 dinal, straight to slightly winding, with the larval mines either in 

 groups or connected, or they form a broad common chamber, and 

 all are exposed in the inner bark. The pupal cells are located at the 



-Tfl'OftAX- 



-ABDOMEN 



lis SI 



CD x EL 



CD CD 3. 

 ' Oq 03 



O CD V O p, 



end of the larval mines or in the larval chambers and are usually 

 exposed. 



In species 12 to 13 the egg galleries are straight or slightly winding, 

 sometimes branched, the larval mines are in groups and exposed in 

 the inner bark, and the pupal cells are exposed or concealed. 

 15300—00 3 



