PEELIMIXAKY CLASSTFICATIOX OF SCOLYTOIDEA. 225 



II. Pronotum vrith anterior doi-sal ai'ea commouly smooth; head exposed or rarely 

 concealed fi'oni above; tai-si with joint 3 simple or bilobed. 



C. Antennal club subglobose, compressed to laminate, never conical. 



a3. Body slender to moderately stout; pronotum longer than broad or not 



broader than long 7. Subfamily Cryptm'ginae. 



a4. Body stout; pronotum always broader than long. 



8. Subfamily Phloeotribinse. 



D. Antennal club usually conical, rarely compressed -.9. Subfamily Hylesininse. 



10. Subfamily Phloeoborinse. 



Family SCOLYTID^. 



Key to the Subfamilies. 



(See Pis. XII, XV, XYI.) 



I. Pronotum constricted towaixl the middle; anterior tai'si with joint 3 simple. 



11. Subfamily Coptonotinae. 

 II. Pronotum not constricted toward the middle; anterior tai'si with joint 3 simple or 

 bUobed. 



A. Anterior tibia with small tooth on inner apical angle extending beyond the 

 tarsal insertion; tibia with at least one tooth on the outer mai'gin, in addition 

 to the apical one. 



al. Eyes not divided; tibia with outer mai'gin ai-med. 



bl. Pronotum with transvei-se rugosities on anterior ai-ea. 



12. Subfamily Hexacolinae. 

 b2. Pronotum without transveree nigosities on anterior area. 



13. Subfamily Bothrosterninae. 

 a2. Eyes di^T.ded; tibia with outer margin unai'med. '^ 



14. Subfamily Hyon-h^-nchinse. 



B. Anterior tibia with small tooth on inner apical angle not extending beyond the 

 tarsal insertion. 



a3. Abdominal sternum convex thi-oughout; antennal scape not very short, 



15. Subfamily Camptoceiinse. 

 a4. Abdominal sternum not convex throughout; antennal scape very short. 



16. Subfamily Scolj^nse. 



Family SCOLYTOPLATYPODID^. 



(See Pis. XII, XVI.) 



Anterior tibia with prominent lateral process at outer angle; thii'd tai'sal joint 

 simple 17. Subfamily Scolytoplatypodinae. 



Family PLATYPODIDiE. 



Key to the Subfamilies. 

 (See Pis. XII, XVI.) 



I. Third tarsal joint simple 18. Subfamily Platypodinae. 



II. Third tai'sal joint bilobed 19. Subfamily Genyocerinse. 



20. Subfamily Chapuisinae. 



" Uncertain fi'om description whether or not inner angle of anterior tibia is produced 

 beyond the tarsal insertion. 



