454 COLEOPTERA OF NORTH AMERICA. 



scape) are longer and more slender. The rostrum varies in form 

 and is usually short, stout, flattened above, and deeply notched 

 at tip. In one genus however the rostrum is decidedly Periteloid 

 with less divergent alse. All the genera excepting Artipus have 

 the anterior tibiae denticulate within. 



Our genera are as follows: — 

 Rostrum short, stout ; scrobes linear in front ; 



Articular surface of liind tibiae scaly ; anterior tibise not denticulate 



within. Artipus. 



Articular surfaces of hind tibise glabrous ; anterior tibise more or le.s.s 



denticulate within ; 



Articular surfaces of hind tibise very feebly or not cavernous ; tips of 



hind tibise M'ith, at most, a double row of fimbriae. Aramigus. 



Articular surfaces of hind tibise strongly cavernous ; tijis of hind tibiae 



with oval scaly space. Phacepholis. 



Rostrum moderately elongate ; scrobes cavernous in front ; 



Articular surfaces of hind tibife sparsely scaly. Achrastenus. 



Artipus has a form somewhat i*esembling Cyphus, without 

 however having the humeri prominent. The next two genera, 

 especially Aramigus, resemble an elongate Strophosomus. Achra- 

 stenus resembles Peritelus. 



The species all occur in the Atlantic region, extending in some 

 cases to Colorado, Texas, and Montana. 



Group 111. — Aphrasti. 



Head broader behind the eyes; scrobes slightly visible from 

 a!)ove, deep, directed toward the eyes but not reaching them, 

 gradually l)roader behind. Antenna? moderate. Elytra slightly 

 wider at base than the thorax, humeri obtuse. Scutellum distinct. 

 Articnlar surface of hind tibise not cavernous, slightly scaly. 

 Claws connate. 



The structure of the tarsal claws will serve to distinguish this 

 group from either of the preceding. The outer stria of the elytra 

 joins the next inner at one-third from the base as in all the Cyphini 

 and the genae are deeply eraarginate. 



Two species of Aphrastus constitute this group in our fauna, 

 and occur in the Atlantic region. 



Tribe III.— EVOTIXI. 



Kostrum longer than the head, usually quadrangular and 

 dilated at ti[), the latter eraarginate. Genaj not or feebly emar- 



