364 



REVISION OF THE TENEHRION1D/E OF AMERICA, 



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

 what distant from them ; never overlapping. 

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

 maxillary palpi oval ; mentum small. 

 Head of male tuberculate ; mandibles with a horn above. 



Mandibles above broad, recurved, and not toothed. GNATHOCERUS. 

 Mandibles above slender, incurved and toothed. echooeuus. 

 Head of male with two long horns, arising within and 



above the eyes. evoplus. 



Head of male not tuberculate; last joint of maxillary palpi 

 triangular; mentum moderate. 

 Epipleurae entire. 



Anterior tibiae slender, similar to the middle tibiae. 

 Head of male with two tubercles above; femora 



mutic. ULOSONIA. 



Head of male simple ; femora broad and with a 



broad tooth near apex. meuotemnus. 



Anterior tibia' more or less dilated; broader than 

 the middle tibiae. 

 Prosternum prolonged; mesostcrnum deeply 



emarginate. mycotrogus. 



Prosternum not prolonged; mesosternum very 

 slightly concave. 

 Front tibiae not denticulate ; last joint of 



antennae quadrangular, truncate. afiianotUS. 

 Front tibiae finely denticulate ; last joint 



of antenna; oval. ALPHITOBlUS. 



Epipleurae abbreviated. 



Anterior tibiae slender. 



First joint of hind tarsi long. CYSJ&VS. 



First joint of hind tarsi short. metaclisa. 



"Anterior tibiae broad, serrate. uloma. 



Base of thorax margined, hind angles covering the humeral angles 

 of the elytra; outer joints of antennae not perfoliate. 

 Anterior tibiae slightly dilated, finely denticulate. Epipleurae 

 abbreviated. Last joint of maxillary palpi broadly 

 triangular. EUTOCHIA. 



