360 COLEOPTERA OF NORTH AMERICA. 



Sub-Family I.— TENTYRIINJE. 



The species of tliis sub-family are distinguished by the middle 

 coxae being entirely inclosed by the sterna, without any trocliantin ; 

 the side pieces of the mesothorax consequently do not extend to 

 the coxal cavities; the ventral segments are entirely corneous, the 

 8d and 4th having no vestige of a posterior coriaceous margin. 

 Besides these two distinguishing characters, common to all the 

 tribes,' there are others worthy of notice, which belong to indi- 

 vidual tribes, and are not found to recur in the other two sub- 

 families. 



The species, with the exception of Epitragini and a few Thino- 

 batini, are apterous, and the metasternum is very short, except 

 in the winged species. In Zopherini the eyes are very finely 

 granulated, a singular exception in this family. The mentum is 

 frequently very large, so as to fill entirely the gular cavity, and 

 to cover completely the maxillie and ligula, so that the gular pro- 

 cess usually supporting it ceases to exist. This character recurs 

 again only in certain Asidini of the next sub-family. The tarsi 

 Jire sometimes spinous, sometimes pubescent beneath. The front 

 is frequently trilobed. 



The tribes represented in our fauna are as follows : — 



Mentum large, concealing both maxillae and ligula ; 

 Episterna of raetathorax very wide ; front trilobed ; 



Middle lobe of front truncate ; mandibles concealed. I. Craniotini. 

 Middle lobe long ; clasped by the mandibles. II. Epiphysini. 



Episterna of metathorax narrow ; 

 Front uni- or trilobed ; 



Body apterous, metasternum short. III. Gnathosiini. 



Body winged, metasternum long ; 



Anterior tibiae slender, with two spurs. V. Epiteagini. 



Anterior tibiae with outer angle prolonged, one spur. 



VI. Cnemodini. 

 Front broadly rounded. IV. Thinobatini. 



Mentum large, concealing either maxill:e or ligula, never both. 



Tibial spurs distinct; VII. Batuliini. 



Tibial spurs very minute ; 



Anterior coxae widely separated ; 



Eyes transverse, finely granulated. VIII. Zopherini. 



Eyes round, coarsely granulated. IX. Usechixi. 



Anterior coxae narrowly separated, antennae 11-jointed. 



XI. Stenosiini. 

 Anterior coxae contiguous, antenuje 10-jointed. X. Dacodekini. 



