THE SCOLYTID BEETLES. 



~^__ Epistemw 



_ Exocoxal piece 



Epimerum 



Stcrndlar area 

 ~ 'Coxa 

 Sternum 

 Episternum 

 Median line 

 Sternellar piece 



2. Dendroctonus valens: Adult, ventral aspect. , Sternellar area. (Original.) 



\ S 



