364 REVISION OF THE TENEBRIONIDjE OF AMERICA, 



Base of thorax applied against the bases of the elytra, or some- 

 what distant from them; never overlapping. 

 Head ol male either tuberculate or horned, and last joint of 

 maxillary palpi oval; mentnm small. 

 Head of male tuherculate; mandibles withahom above. 



Mandibles above broad, recurved, and nol toothed, gnathocerus. 

 Mandibles above slender, incurved and toothed. i.< ia>< i 

 Head of male with two long horns, arising within and 



alin\ e tin' eves. EVOPLUS. 



Head ol' male not tuberculate; last joint of maxillary palpi 

 triangular; mentum moderate. 

 Epipleura? entire 



Anterior tibiae slender, similar to the middle tibia?. 

 Head of male with two tubercles above ; femora 



mutic. ulosonia. 



Head of male simple; femora broad and with a 



broad tooth near apex. merotemnus. 



Anterior tibia? more or less dilated, broader than 

 the middle tibia?. 

 Prosternum prolonged; mesosternum deeply 



emarginate. mycotrogus. 



Prosternum not prolonged; mesosternum very 

 slightlj concave. 

 Front tibia? not denticulate; last joint of 



anteniue quadrangular, truncate. APHANOTIJS. 

 front tibia? finelj denticulate; last joint 



of antenna' oval. ALPHITOBIUS. 



Epipleura? abbreA lated. 



Anterior tibia? slender. 



First joint of hind tarsi long. cv.x.i:rs. 



First joint of hind tarsi short. METAi USA. 



Anterior tibia? broad, serrate. ULOMA. 



Base of thorax margined, hind angles covering the humeral angles 

 of the elytra ; outer joints of antenna? not perfoliate. 

 Anterior tibia? slightly dilated, finely denticulate. Epipleura? 

 abbreviated. Last joint of maxillary palpi broadly 

 triangular. EUTOCHIA. 



