300 REVISION OF THE TENEBRIONIftffi OF AMERICA, 



Tarsi spinous or setose beneath. 



Elytra widely embracing abdomen. blaptini. 



Elytra narrowly embracing abdomen. scaurini. 



Tarsi with coarse, almost spinous hairs. amphidorint. 



Tarsi finelj pubescent beneath. tenebrionini. 



Front broadly dilated at the sides, emarginate ante- 

 riorly. 

 Anterior tarsi of l dilated. pedinint. 



interior tarsi oi s not dilated. opathim. 



Hind coxa? oblique ; tarsi spinous. crtpticini. 



Anterior coxae sub-transverse; middle coxae without tro- 

 chantin; third joint of antenna? always short, outer 

 joints more or less perfoliate 

 Tarsi pubescent. Last joint always long. ulo.mi.vi. 



Penultimate joint of tarsi bilobed. heterotarsini. 



Tibia? all more or less dilated and fossorial. trachyscelini. 



Ej'es more prominent than the sides of the front, usually rounded, 



feebly or not at all emarginate. diaperini. 



First joint of tarsi very small, outer joints gradually thicker, longer 



and compressed. Gense transversely sulcate. boletophagini. 



Front either with a broad coriaceous band or articulating directly with 

 a coriaceous clypeus. Elytra never widely embracing abdo- 

 men. Third joint of antennas long. 

 Sides of front not obliquelj elevated. 



Abdomen pedunculate; antenna' slender. apocryphint. 



Abdomen not pedunculate; antenna 1 with the outer joints 



usually compressed. helopini. 



Sides of front obliquely elevated. 



Metasternum very short; body apterous. meracanthini. 



Metasternum long; body slender and winged. strongyi.iim. 



tribe xvii — blaptini. 



This tribe contains not only a larger number of species, but also species of a greater 



size than any others ol our fauna. Genera from every part of the globe are found lure, 

 and tin' species in each portion are usually among the; largesl of the Tenehrinnida' found 



there. All are black or dark brownish, and variously though never very roughlj sculp- 

 tured, and a few sp ;cies are pubescent or pilose. All are apterous. Our species are 



