456 COLEOPTERA OF NORTH AMERICA. 



Group III. — Evotl. 



Rostrum elongate, strongly dilated and auriculate at tij). 

 Scrobes visible from above. Scutellum distinct. Elytra wider 

 at base than the thorax, humeri moderately prominent; marginal 

 stria entire. Articular surfaces of hind tibiae feebly cavernous. 

 Claws free. 



Evotus naao is the only representative of this group known. 

 It occjars from Colorado to Oregon. 



Tribe IV.— PHYLLOBIII^I. 



Head prolonged behind the eyes, these round or slightly oval. 

 Mentum small, usually concealing the maxilla?. Rostrum usually 

 stout, cylindrical, truncate or very feebly emarginate at tip. Gense 

 not emarginate. Scrobes short, .subterniinal. Meso- and meta- 

 sternal side pieces broad, the former diagonally divided. Articular 

 surfaces of the hind tibiae terminal, glabrous. Claws connate. 

 Tenth elytral stria free in its entire extent. Scutellum distinct. 



The above characters serve to isolate a number of genera evi- 

 dently closely allied among themselves, and also with well-marked 

 affinity with certain members of the tribe Cyphini. The mandi- 

 bular scar is not prominent in any of our genera, but is round 

 and directly on the face of the mandible itself. The deciduous 

 ))iece is moderately long, glabrous, and regularly falciform. The 

 mentum varies in size in the genera of this group, but not to the 

 extent of causing Scythropus and Phyllobius to be widely sepa- 

 rated. 



The following gefiera compose this tribe in our fauna: — 



Elytra wider at base than the thorax ; 

 Mentum entirely concealing the maxillfe. Phyllobius. 



Mentum smaller, maxillfe visible at the sides ; 



Rostrum slightly narrower than the head ; alae slightly divergent. 



Cyphomimus. 

 Rostrum short, stout; ake not divergent. Scythropus. 



Jllytra elongate, oval, as narrow at base as the thorax; 



Mentum small, maxill?e entirely exposed. Mitostylus. 



In Mitostylus the subinentum is very slightly pedunculate. 

 Scythropus has the gula semicircularly emarginate, and the 

 maxillfe visible at the sides of the mentum, the other three 

 genera have the gular notch nearly square. In the genera 2 and 



