THE GROUND BEETLES. 141 



Tribe XIII. I.EP.IIXI. 



Antenna' slender, arising from lieneatli a slifihl frontal i-idge, 

 the three basal joints usually glabrous. Head oval, constricted to 

 a neck or not. ]\Ientum more or les.s emarginate, toothed or not ; 

 palpi variable, the terminal .joint eciual to or longer than the pre- 

 ceding, the latter with two seta- in front. Thorax variable in form, 

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

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

 rowly intlexed. Prosternum usiially obtuse at tip ; hind coxee con- 

 tiguous. 



The follomng papers treat of the genera composing the tribe: 



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

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



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

 Brook. Ent. Soc, II, 1880, 86; IV, 1881, 39^4; 53-55. 



Morn. — "Synoijsis of the Species of the Tribe Lebiini" in Trans. 

 Amer. Ent. Soc, X, 1882, 126-163. 



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

 United States fauna. Of these, 14 are represented in the collection 

 from Indiana, while another may occur. 



KEY TO INDIANA GENEKA OF LEBIINI. 



a. Tibial spurs very long. 



J). Head not constricted behind tlie eyes ; tarsal claws in our species 

 with fine, short teeth ; tibial spurs with fine teetli. 



XXXIX. Tetbagonoderus. 

 hh. Head constricted; tarsal claws with long teeth; tibial spurs simple. 



Xemotabsus. 

 <ia. Tibial spurs short or at most moderate in length. 

 c. Mandibles with distinct grooves on outer side. 



d. Head constricted behind the e.ves. XL. Leiiia. 



)1(1. Head not constricted. 



c. Labrum large. ))rominent, covering in great jinrt the mandibles; 

 antennae with three l>asal .I'oints glabrous; el.vtra dark bluish- 

 green. XIJ. ('OPTODEEA. 

 cc. Labrum moderate, not large. 



f. Tarsi slender, fourth .joint entire. 

 fi. Labial paljii slender: color lilack or i}iceous. 

 /(. Thorax truncate at base. 



(. iMentum not toothed; claws of tarsi .serrate; lengtli <! ■ 



7.5 mm. XLII. Dromius. 



ii. Mentuni toothed; claws of tarsi simple; smaller, not 



over 4 mm. XLIII. Apristus. 



lih. Thora.\ slightly lobed at base; claws of tarsi serr.ate: 



length less than 4 mm. 



/. Mentum not toothed. XLIV. Bleciibus. 



