200 COLEOPTERA OP NORTH AMERICA 



The antennse are inserted in cavities narrowing the front, which 

 does not expand again anteriorly, as in the next tribe; the mouth 

 is small, deflexed, but not applied to the prosternum; the inentum 

 is entirely corneous. The prothorax is truncate at base, closely 

 applied to the elytra. The prosternum is broad, truncate before 

 and behind, with the lateral sutures parallel. The mesosternum 

 is not visible; the metasternuni is broadly truncate in front, and 

 applied to the prosternum ; the epimera of the metasternuni are 

 triangular, not covered by the abdomen. The hind coxie are not 

 dilated inwards, slightly broader outwards, and extend to the 

 elytra; the anterior margin is slightly concave, the hind one not 

 oblique. The legs are not contractile ; the claws are broadly 

 toothed. The form is cylindrical, and color bluish-black. 



Tribe VI.— AGRILII^I. 



In this tribe the body is usually slender, sometimes, however, 

 very broad and flat; in both cases it is narrowed behind. The 

 species are found on leaves and flowers. 



The front is strongly narrowed by the insertion of the antennas, 

 and is then expanded again, forming two diverging lobes; the 

 anterior part of the head is vertical ; the mouth inferior, and 

 applied to the prosternum in repose; the mentum is large, tri- 

 angular, and corneous. The prothorax is lobed at the base, re- 

 ceiving the convex bases of the elytra. The prosternum is broad 

 in front, with oblique sutures, cuneate behind, and scarcely angu- 

 lated behind the coxce; the mesosternum is small, completely and 

 frequently widely divided ; the metathoracic epimera are small, 

 and frequently not visible. The hind coxa3 are but slightly dilated 

 internally, narrowest at the middle, and broader externally, with 

 the anterior margin more or leas concave, and the hind margin 

 not oblique. The legs are contractile, and the claws are strongly 

 toothed, or even cleft, except in Taphrocerus, where they are 

 connate at base, and simple. 



Two groups exist, in our fauna, as follows: — 



Antennre free. Agrili. 



Antennae received in grooves. Beaches. 



Group I. — Agrili. 

 The body is always elongated ; the prosternum is pointed 

 behind ; the anterior and middle coxae are separated by about 

 the same distance; the anterior margin of the hind coxo3 is very 



