TENEBRIONIDAE. 3'75 



tiuct tvocliaiitin ; hind coxa; oval, vory widely separated ; legs 

 moderate and simple (Eiilabis), or long, variously toothed (Cere- 

 nopus); tibial spurs distinct or large; tarsi spinous beneath. 

 8cutelluni broad, not penetrating between the elytra. 

 Three genera constitute this tribe: — 



Head short, legs simple. Eulabis. 



Head long ; anterior femora more strongly elavate, the posterior in '^ 

 toothed ; 



Outer apical angle of anterior tibite prolonged. Cerenopus. 



Outer angle not prolonged. Argoporis. 



Eulabis occurs in California; Cerenopus extends from Nevada 

 to Cape Sail Lucas ; Argoporis is found from New Mexico to 

 California. 



Tribe III.— A]MPHIDORI\I. 



Body oblong, rarely slender, clotiied with long erect hair, 

 apterous ; -head not narrowed behind-, clypeus truncate, labrum 

 visible; eyes transverse, narrow; antennas 11-jointed; mentum 

 small, transverse, truncate in front, supported by a short pedun- 

 cle, ligula visible ; palpi with the terminal joint triangular. 

 Metasternuni short, side pieces narrow; intercoxal process oval 

 or truncate in front. EpipleuriE moderate in width, not reaching- 

 the sutural angle. Legs moderate, tibial spurs small ; tarsi 

 rather short, clothed beneath with coarse hairs, souiotimes with 

 spines intermixed. 



The vestiture of the tarsi seems to indicate the intermediate 

 position of these genera between tlie Blaptini and Tenebrionini ; 

 there is, however, some relationship indicated between Stenotri- 

 chus and the Helopini. 



Our genera are separated as follows : — 



Tibial spurs small, but distinct; intercoxal process broad, truncate; epi- 



pleurse becoming rapidly broader toward the base ; 



Posterior tarsi nearly as long as the tibia?, the first joint as long as tlie 



next two. Amphidora. 



Posterior tarsi much shorter than the tibia?, the first joint but litth' 



longer than the second. Cratidus. 



Tibial spurs very minute; intercoxal process triangular, oval at tip; epi- 



pleurae v(iry gradually wider to base ; 



Posterior tarsi shorter than the tibiae, the llrst joint a little longer than 



the second. Stenotrichus. 



