240 COLEOPTERA OF NORTH AMERICA. 



armed with :i larj^e dorsal tubercle. The anterior coxas are 

 slightly pi'oiiiinent internally. The onychiuni between the flaws 

 is wanting. 



Our genera are but two in number, and each represents a sepa- 

 rate group of this sub-tribe; the groups of genuine Ateuclii and 

 Minthophili not occurring in our fauna. 

 Epipleurte of the elytra narrow, or wanting ; anterior tarsi distinct. 



Group I. Gymkopleuki. 



Epipleurse distinct, narrow ; scntellnm none. Canthon. 



Epipleurse of the elytra wide ; anterior tarsi wanting. 



Group II. Deltociiila. 



Anterior tibiae not prolonged at the extremity. Deltochilum. 



Sub-Tribe 2. — Coprilli (genuini). 



The gradually thickened middle and hind ti))iEe unfit these 

 insects for transporting the balls of material which serve for the 

 food of the larva? ; though some of the species do construct l)a]ls, 

 they bury them in the place where they are formed. The sexual 

 differences are frequently strongly marked, the male having horns 

 on the head or thorax. The epipleura? are alwaj's narrow, and 

 the first joint of the tarsi is elongated. The anterior tarsi are 

 wanting in some species of Phanseus, and the claws are all want- 

 ing in the same genus. 



The following groups are represented in our fauna: — 



Third joint of labial palpi distinct ; 



Anterior coxae very transverse, not prominent. Scatonomi. 



Anterior coxaa short, prominent ; labial palpi dilated. Copkes. 



Third joint of labial palpi obsolet('. Onthophagi. 



Group I. — Scatonomi. 



Our only representative of this group is Choeridium, containing 

 two moderately small, convex, shining, bronzed black species 

 found in dung They resemble Hister, with finely striate elytra. 

 The 3-jointed labial palpi, and the transverse, not prominent, 

 anterior coxae, readily distinguish it from the other groups. The 

 claws are small, witliout onychium, but the tip of the last joint of 

 the tarsi is prolonged beneath into an obtuse process one-half as 

 long as the claws. 



Group II. — Copies. 



The labial palpi are 3-jointed, broad, and compressed; the 

 anterior coxae are conical, large, and prominent. The last joint 



