936 FAMILY L. SCAKAK.KILU-L 



Tribe IV. GEOTRTTPINI. 



Rounded, convex beetles having the mandibles and labruni 

 prominent, of horn-like texture; antenna? 11-jointed, club 3-jointed, 

 variable in form; elytra usually strongly striate, covering the abdo- 

 men ; the middle coxa-, ventral segments and tarsal claws as in Tribe 

 III. The thorax of some males, and more rarely the head, is armed 

 with horns or tubercles. ^Nlost of the species live in excrement; 

 others, according to Horn, are veritable hoboes, "wandering about 

 without visible means of support." The principal literature treat- 

 ing of the North American members of the tribe is as follows: 



Horn. 'Notes on Genera of Coprophagus Scarabaeidae of the 



T. S.," in Trans. Amer. Ent. Soc., Ill, 1870. The genera 



Bradycinetus, I>on>(><-< nt* and Ortonttriif: are treated on pp. 



48-50. 

 Iloni. "Geotrupes of Boreal America," in Trans. Amer. Ent. 



Hoc., I, 1868, 313-322. 

 Horn. "Synopsis of the Geotrupes of the U. S.," in Trans. 



Amer. Ent. Soe., VIII, 1880, 145. 

 IHdiicJitti-f'i, F >!< rid-. "Some account of our Species of Geo- 



trupes," in Psyche, V, 188N, 103-110. 

 Sclta'fl'< r, dins. "On Bradycinetus and Bolboceras of North 



America, with Notes on other Genera," in Trans. Amer. Ent. 



Soc., XXXII, 1006, 249-278. 



Of the five genera of Geotrupini recognized from the United 

 States, representatives of four have been taken in Indiana: 



KEY TO INDIANA GENERA OF GEOTRVPINI. 



I 



(/. Club of antenna 1 large, round, convex on both sides. (Fig. 4, No. 14.) 

 ft. Eyes only partially divided by a process from the side of bc.-id. 



XII. liOMJO.'ERAS. 



1>1>. Eyes entirely divided. 



c. Color above black and reddish-brown: process between the middle 

 eox;e with an erect tooth-like elevation. 



XIII. BOL.ROCEROSOMA. 



cc. Color above uniform chestnut brown: process between the middle 



coxa- without a tooth-like elevation. XIV. ODOXTVEVS. 



an. ( 1 lub of antenna* smaller, composed of leaf-like plates. XV. GEOTRUPES. 



XII. HOLBOCERAS Kirby. 1818. (Gr., "bull -' horn.") 



This genus is principally distinguished by having the eyes only 

 partly divided and by the middle cox;v being continguous or very 

 close together. 



