SCARAB^IDAE. 241 



of the tarsi has no onychium, and in one genus tbo claws are 

 wanting; in Copris the claws are small, and the inferior portion 

 of the joint is prolonged into a process as long as the claws. 

 The anterior tarsi are wanting in Phanasus; and in one genns, 

 Dendropaenion, from Brazil, the tarsi have only two joints. 



Our genera are but two; neither is represented on the Pacific 

 coast. 



First joint of antenna! club not receiving the others ; metasternnm rect- 

 angular ; claws distinct ; front legs with tarsi. Copris. 



First joint of anteimal clnb hollowed, receiving the others; nn'tasterniun 

 rliomboidal ; claws wanting ; front legs without tarsi. Phanaeus. 



In both of these genera sexual characters are usually obvious 

 in tubercles and horns on the head and thorax. The species of 

 Phanoeus are brilliantly colored, and P. carnifex, with its rough 

 copper-colored thorax and green elytra, is familiar to every col- 

 lector. 



Group III. — Onthophagi. 



Several species of Onthophagus from the Atlantic slope, and 

 one Oniticellus from California represent this group. 



The anterior coxas are large, conical, and protuberant ; the 

 labial palpi are but 2-jointed, the third joint being obsolete; the 

 tarsal claws are distinct, and the onychium is long, with the two 

 usual seta3. 



In some of the species the head or thorax of the males is armed 

 with horns. 



The genera are thus distinguished: — 



Antenn;e 9-jointed ; scutellum invisible. Onthophagus. 



Antennaj 8-joiuted ; scutellum distinct. Oniticellus. 



Tribe II.— APHODIIIVI. 



Species of small size, and oblong, convex, or cylindrical form, 

 living chiefly in excrements. The clypeus, as in Coprini, is dilated 

 so as to cover the oral organs, but in one genus, ^^gialia, th(^y an- 

 visible beyond the apex of the clypeus; the maxilla? and mandibles 

 are variable in form; antenna 9-jointed, clnb 3-jointed; epimera 

 of metathorax covered; middle coxas oblique, contiguous in our 

 genera; posterior tibiae with two spurs; elytra covering the 

 pygidinm entirely or in part; vontrnl segments six, all free; 

 tarsi with distinct claws and small bisotose onychium. 

 16 



