THE Ci ROUND BEETLES. 141 



Tribe XIII. IJ;mi\I. 



Antenna^ slendei". arisiiiii' i'roiii beneath a sliiilit frontal ridge, 

 the three basal joints usually ji'labi'ous. Head oval, constricted to 

 a neek or not. .Aleiituni more or less eniarginate, toothed or not; 

 palpi variable, the terminal joint ecjiial to or long-er than the pre- 

 ceding, the latter with two sette in front. Thorax vai-iable in form, 

 sides distinctly margined and with a seta on each side and at basal 

 angle. Elytra truncate at tip, the margin acute, entire and nar- 

 rowly inflexed. Prosternum usually obtuse at tip ; hind coxffi con- 

 tiguous. 



The following papers treat of the genera composing the tribe: 



Horn. — "Revision of the Species of Lebia of the United States" 

 in Trans. Amer. Ent. Soe., IV, 1872, 130-142. 



Horn. — "Synoptic Tables" of most of the genera, in Bull. 

 Brook. Ent. Soc, II. 1880, 86; IV, 1881, 39-44; 53-55. 



Horn.- — -"Synopsis of the Species of the Tribe Lebiini" in Trans. 

 Amer. Ent. Soc. X,"l882, 126-163. 



The tribe is a large one. embracing no less than 21 genera in the 

 Tnited States fauna. Of these, 14 are re]:)resented in the collection 

 from Indiana, while another may occur. 



KEY TO INDIANA GENERA OF IJCIUINI. 



a. Tibial spurs very long. 



ft. Head not constricted behind the eyes ; tarsal claws in our species 

 with fine, short teeth; tibial spars with fine teeth. 



XXXIX. Tetkagonodebus. 

 hi). Head constricted; tarsal ehiws with long teeth; tibial spurs simple. 



Nemotabsus. 

 ««. Tibial spurs short or at most moderate in length. 

 G. Mandibles with distinct grooves on outer side. 



d. Head constricted behind the eyes. XL. Lep.ia. 



drl. Head not constricted. 



('. I.abrum large, prominent, covering in gre;it p.irl tlie mandibles: 

 antenna? with three basal joints glabrous; elviia dark bluish- 

 green. XI,I. ("OPTODEBA. 

 ec. Labrum mod(>rate. lu.t lai-ge. 



/'. Tarsi slender. Idnrlli Jeiid entirt'. 

 .'/. Labial palpi slender: color black or jjiceous. 

 //. Thorax tiaincate at base. 



i. Mentnm not toollied; claws of farsi serrate; length G- 



7.5 mm. XLll. Dkomius. 



//. Meutum toothed: claws of taisi simple; smaller, not 



over 4 mm. XLIIL Apristis. 



////. Thorax slightly lobed at base: claws of tarei serrate; 



length less thrui 4 nun. 



,/. Mentnm not toothed. XLIV. Bleciikus. 



