OF PHILADELPHIA. 133 



ATEUCHUS Fabr. 



1. A. NIGRICORNIS. — Black, minutely scabrous J clypeus six- 

 toothed, incisure of the posterior tooth much less profound than 

 that of the preceding one ; anterior tibia three-toothed. 



Inhabits the United States. 



Body deep black, immaculate, slightly scabrous with elevated 

 points or minute lines; head with cupreous reflexions: clypeus 

 six-toothed ; the two anterior teeth more prominent, flattened, 

 conic, slightly recurved; lateral ones smaller, more like serratures; 

 the exterior one much the smallest, and separated from the pre- 

 ceding tooth by a slight incisure : antennje black ; thorax con- 

 vex, with cupreous reflexions ; an obsolete, indented, longitudinal, 

 obtuse line, near the base ; posterior edge regularly arquated ; 

 lateral edge angulated in the iniddle ; anterior margin profoundly 

 emarginate for the reception of the head ; elytra with numerous 

 elevated points, and with obsolete impunctured striae : anterior 

 tibia dentate upon the exterior edge, the three terminal teeth 

 large. 



Length more than one-fourth of an inch. 



I observed this species near Cape Gerardeau, and in the inter- 

 mediate country between that town and the Rocky Mountains ; 

 and as I formerly obtained two specimens in New Jersey, I think 

 it probable that it inhabits a principal portion of our country; 

 but it does not seem to be common anywhere. Those I ob- 

 served in New Jersey were busily engaged in [208] rolling a 

 small pellet of hog dung, which, however, was not shaped in the 

 spherical form. 



[This and the two following belong to Canthon 111. ( Coprohius 

 Latr.) — Leg.] 



2. A. OBSOLETUS. — Cupreous polished ; clypeus bidentate 

 before ; elytra obsoletely striated. 



Inhabits near the Rocky Mountains. 



Body entirely cupreous, polished, immaculate, with very 

 minute punctures : clypeus slightly margined anteriorly with 

 dull green ; an oblique, slightly impressed, glabrous line before 

 the eye ; edge bidentate before, and with an obsolete remote 

 tooth each side before the eyes : antennae blackish : thorax a 

 little angulated each side on the edge : elytra obsoletely striated. 

 1823.] 



