TENEBRIONIDAE. 213 



Mesosternum emarginate, receiving the prostermim, body winged. 



IV. Epitragini. 

 Mentum large, concealing either the ligula or maxillae, never both ; 

 (Episterna of metathorax narrow in our tribes ;) 

 Tibial spurs distinct. V. Anepsiini. 



Tibial spurs very minute; 

 Eyes very finely granulated. VI. Zopherim. 



Eyes coarsely granulated, head constricted behind ; 

 Anterior coxae contiguous ; antennas 10-jointed. 



VII. Dacoderini. 

 Anterior coxae separated ; antennae 11-jointed. VIII. Stekosini. 

 Mentum small, maxillae and ligula both exposed ; 

 Prothorax globose, not margined ; mesothorax pedunculated. 



IX. Apocrtphini. 



Tribe I.— EPIPHYSIAL 



Body short, convex, apterous ; epistoma trilobed, labrum pro- 

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

 ligula and maxilla? concealed ; thorax very short, anterior angles 

 acute, prominent ; elytra globose, sides embracing widely the 

 flanks, epipleurae narrow ; anterior coxae widely separated, pro- 

 sternum closely fitting to the mesosternum ; hind coxa? transverse, 

 widely separated. Tarsi ciliate beneath. 



This tribe contains but two genera, each characterizing a sepa- 

 rate group. Epiphysa, with short tarsi and glabrous body, is 

 found at the Cape of Good Hope. Edrotes, with slender tarsi 

 and sparsely clothed with long hairs, contains two species : one 

 (E. rotundus) found on the eastern slope of the Rocky Moun- 

 tains; the other (E. ventricosus Lee.) in the Colorado valley, 

 California. 



Tribe II.— GXATHOSIIXI. 



Body variable in form, apterous ; epistoma trilobed in our 

 genera, but with at least a prominent middle lobe, always leaving 

 the base of the mandibles exposed ; labruni prominent ; mentum 

 very large, entirely filling the gular cavity ; ligula and maxilla? 

 concealed ; elytra widely embracing the flanks of the abdomen, or 

 not ; presternum not adapted to the mesosternum. Tarsi (of the 

 genera of America) with rigid hairs beneath. 



The sixth tribe of Lacordaire, Tentyrides', appears to me to 

 be capable of a natural division into two, according as the epis- 

 toma is lobed or not. The limits of these tribes seem, as far as I 

 have been able to refer to foreign genera, to be well defined. 



