912 FAMILY 1;. SCARAB TID.K. 



Tribe I. COl'UINl. 



Beetles of rounded form ;ind variable size, which live almost 

 exclusively in excrement or decaying fungi. They have the clypeus 

 expanded so as to cover entirely the mouth organs; the mandibles 

 principally membranous, with only the outer margin horn-like; 

 middle legs widely separated; elytra subtruncate at apex, leaving 

 the pygidium exposed. The tribe is subdivided into seven genera, 

 five of which are represented in Indiana. The principal literature 

 treating of the North American genera is by 



Horn. "Notes on Some Genera of Coprophagus Scaraba?ida3 of 



the Tinted States," in Trans. Amer. Ent. Soc., III, 1870, 



42-51. 

 If nrii.- -"Synonymical Notes and Descriptions of New Species of 



North American Coleoptera," in Trans. Amer. Ent. Soc., V, 



187"). The genera ('Itcrridiuin and Onthophayus are treated 



mi pp. 137-144. 

 W<tii<'lnu-<l, AYr <l<i i<'~k. "On the Species of Canthon and Pha- 



na>us of the United States, with Notes on other Genera," in 



Trans. Amer. Ent. Soc., XII, 1885. 163-172. 

 Krlni /j't r. Clms. "On Bradycinetus and Bolboceras of North 



America, with Notes on other Scarabseidas, " in Trans. Amer. 



Ent. Soc, XXXII, JOOfi, pp. 249-278. 



KEY TO INDIANA. GENERA OF COPKINI. 



a. Middle and bind tibi;p, slender, curved, but little enlarged at tip; bead 



and tborax never horned in either sex. I. CANTHON. 



IHI. Middle and bind tibia? much expanded at tip ; males usually with horns 



on the bead or tborax. 

 1>. Third joint of labial palpi distinct. 



c. Size small, not over 7 mm.; front coxne very transverse, not promi- 

 nent. II. CHCERIDH M. 

 <<:: Size larger, 10 to 27 mm.; front coxa 1 short, prominent. 

 il. Front legs with tarsi; tarsal claws distinct; cnlur black. 



III. COPRIS. 



<1<1. Front legs of males without tarsi; all tarsal claws wanting; col- 

 ors metallic and green. IV. PHAN/EUS. 

 lib. Labial palpi 2-jointed : scutellum invisible; size small, not over 8 mm. 



V. ONTIIOPHAGUS. 



I. CANTHOX TToffm. 1817. (Gr., "a kind of beetle.") 



Black or bronzed insects often seen along country roads and 

 pathways, rolling balls of dung from place to place, hence popularly 

 known as "tumble-bugs.' The balls are rolled often to a consider- 



