TENEBRIONIDAE. 363 



Tn some individuals, both of Eurymetopon and Emmenastus, 

 the labrum is retracted and almost concealed under the epistoma. 

 In both genera are species with and without wings; in the former 

 case the metasternum is longer than the first ventral segment. 



All the species of this tribe are Californian, except a few Em- 

 menastus from Nebraska, New Mexico, and Texas. The winged 

 species are found under bark of Pi^oaopis, the others under stones. 

 Cryptadius Lee. is not distinct from P^urymetopon. 



Tribe V.— EPBTRAGIIVI. 



Body oval, winged ; epistoma trilobed (in our species); labrum 

 prominent; mentum very large, entirely filling the gular cavity; 

 ligula and maxillai concealed; elytra with narrow epipleura?; 

 prosternum often prolonged and pointed, fitting into the deeply 

 emarginate mesosiernum; metasternum long, with narrow side 

 pieces; middle coxa3 without trochantin, inclosed by the sterna; 

 hind coxce approximate, intercoxal process of the abdomen acute; 

 tarsi usually pubescent beneath. 



Prosternum prolonged, received by mesosternum. Epitragus. 



Prosternum not prolonged ; 



Tai'si pubescent beneath ; head without superciliary ridges. 



Schcenicus. 



Tarsi spinous beneath ; head with superciliary ridges. 



Chilometopon. 



The characters here given do not apply to the tribe as received 

 by Lacordaire, which might probably with advantage be divided. 



Tribe VI.— C]\EMOmi\I. 



Body oblong, winged; front with prominent middle lobe con- 

 cealing the labrum, the lateral lobes slightly dilated over the in- 

 sertion of the antennae, these slender, eleven-jointed, the terminal 

 joint oval acuminate; mentum large, completely closing the gular 

 cavity; prothorax transversely oval, not distinctly margined, pro- 

 sternum not prolonged ; mesosternum narrowly separating the 

 middle coxal cavities which are entirely inclosed externally; 

 metasternum moderately long, the posterior coxaa transverse and 

 separated by a triangular process of the first ventral segment ; 

 epipleuraj narrow, entire. Tarsi slender, and with a double row 

 of short spinules beneath. Anterior tibiie with a tooth at middle 

 of the out(!r edge, the apical angle prolonged and with one ter- 

 minal spur. 



