224 COLEOPTERA OF NORTH AMERICA. 



with the mesosternum, than to be absolutely wanting, as in the 

 first sub-family ; the middle coxse are in no case so closely em- 

 braced by the sterna as in the Tentyriidae. The body is more 

 frequently winged than apterous, and, consequently, the meta- 

 sternum is more frequently long than short ; the mentum is small, 

 or, at most, moderate in size, and does not conceal either ligula 

 or maxillae ; the gular peduncle is always distinct. The anterior 

 coxse are sometimes oval or subtransverse, a character not seen 

 in the other two sub-families ; equally peculiar to this sub-family 

 is the short, coriaceous clypeus seen between the front and labrum 

 in certain tribes. It is here too that the first instances occur of 

 genera with entire mandibles. The tarsi are pubescent beneath, 

 sometimes silky, very rarely spinous or setose. 



A large number of the species are found under bark ; the first 

 four tribes are, however, found on the ground. 

 Our tribes may be separated as follows : — 

 Elytra embracing widely the flanks of the abdomen. I. Blaptini. 



Elytra not embracing widely the flanks of the abdomen ; 

 Front entirely corneous, articulating directly with the labrum ; clypeus 

 not visible ; 

 Middle and hind legs not fossorial ; 

 Front broadly dilated at the sides, emarginate anteriorly ; 



Anterior tarsi of male dilated. II. Pedinini. 



Anterior tarsi of male not dilated. III. Opatkini. 



Front moderately dilated at the sides, not emarginate anteriorly ; 

 Anterior coxae rounded ; trochantin of middle coxa? distinct ; 

 Tarsi spinous or setose beneath. IV. Scaueini. 



Tarsi pubescent ; 



Penultimate joint of tarsi entire. V. Tenebrionini. 



Penultimate joint of tarsi lobed. VI. Heterotaesini. 



Anterior coxse subtransverse, trochantin of middle coxae obsolete. 



VII. Ulomini. 

 Legs all fossorial. VIII. Teachyscelini. 



Front partly coriaceous, or separated from the labrum by a short coria- 

 ceous clypeus ; 

 Tarsi spinous or setose beneath ; 



Anterior tibiae dilated. IX. Phaleeiini. 



Anterior tibiae not dilated. X. Ckypticini. 



Tarsi pubescent ; anterior coxae subtransverse, 

 Genae sulcate for the base of the antennae. XI. Boletophagini. 

 Genae not sulcate. XII. Diapekini. 



Tarsi pubescent, anterior coxae rounded ; 



Antennal ridges on the same plane as the front ; (clypeus distinct) ; 

 Middle coxae without trochantin. XIII. Adelinini. 



Middle coxae with distinct trochantin. XIV. Helopini. 



