912 FAMILY L.— -Sf:AK.\B.i;ir).i:. 



Tribe I. COPRIXl. 



Beetles of rounded fnnn and variiible size, which live almost 

 exclusively in excrement or deea>inc;' 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, 

 Ave of nhieh are i-ci)i'csfnted in Indiana. The prini'ii)al literature 

 treatini;- of tb.e North Anirrican genera is liy 



Hon}. — "Notes on Some Genera of Ccjprophagus SearabseidfE of 

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

 42-51. 

 Horn. — "Synonymical Notes and Descriptions of New Species of 

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

 IST."). The genera fhoridiinn -RTid OnihopJiagus are treated 

 on pp. 137-144. 

 BlaiirJim-il. Frrdrricl-. — "On the Si)eeies of Canthon and Pha- 

 nu'us of the I^nitril States, with Notes on other Genera," in 

 Trans. Ainer. Knt. See., Nil, is,'^."). 163-172. 

 Srlia'fl'cr. Clin.s. — "f)n Bradycinctus and Bolboceras of North 

 Ameriea, witli Xotx-s on other Scarabajida^" in Trans. Amer. 

 Ent. Soc, NXXII, 1906, pp. 240-278. 



KEY TO IN"DIA>A GEXEEA OF COPBINI. 



u. Miadle and hind tibia?, slender, curved, but little enlarged at tip; head 

 and thorax never homed in either sex. I. Caxthox. 



fin. Middle and hind tibite much expanded at tip; males usually with horns 

 on the head or thorax. 

 6. Third joint of labial palpi distinct, 

 c. Size small, not oxev 7 mm.; front coxaa ver.\- transverse, not promi- 

 "®°'^- II. Chceridium. 



cc. Size larger, 10 to 27 mm.: front ciixip short, iiroiiiinent. 

 il Front legs with tarsi; tarsal flaws distinct; color black. 



III. COPBIS. 



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

 ors metallic and green. IV. phax'eus. 

 66. Labial palpi 2-,ic,intc,l : scutellnm invisible; size small. nr,t over S mm. 



V. OXTHOPHAQCS. 



I. Oanthox HofPm. 1S17, (Gr.. "a kind of beetle") 

 Black or bronzed insects often s.-en along countrv roads and 

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

 kno^-n as "tumble-bugs." The balls are rolled oft.'n to a consider- 



