THE GROUND "BEETLES. 119 



192 (740). Badisteb micans Lee, Pi'oc. Phil. Acad. Nat. Sci., II, 1844, 52. 

 Elongate-oval. Above picei.us with a bluish luster, the head darker; 

 antennae dusky brown, the basal joint paler. Thorax one-half wider than 

 long, the basal impressions broader and more shallow than in laticciis. 

 Elytral strise feebly impressed: intervals fiat. length 5.5-6 mm. 



Kosciusko County : rare. October 29. 



19.S (741). Badister reflexus I^ec. Trans. Amer. Ent. Soc, VIII, 1880, 

 166. 

 Elongate-oval, slender. Piceous, feebly shining, the narrow margin of 

 thorax and elytra dull yellow, translucent; antennse dusky, tip of last 

 joint paler ; legs dull yellow. Thorax slightly wider than long, trapezoidal, 

 narrowed behind ; basal Impressions and median line deep ; margins wider 

 than in the two preceding species and more reflexed near the hind angles, 

 which are obtuse, not rounded. Elytral strise fine; intervals broad, nearly 

 flat Length 4 mm. 



Laporte. Marshall, Vigo and Knox counties ; rare. May 20-Sep- 

 tember 2. 



Tribe VIII. PLATYNINI. 



Beetles of medium or small size, having the antennae slender, 

 arising from beneath a slight frontal ridge, three basal joints gla- 

 brous; head oval, rarely elongate, the eyes not very distant from 

 thorax: mandibles moderately prominent, feebly curved, without a 

 seta in outer groove ; mentum deeply emarginate, toothed or not. 

 Thorax variable in form with a bristle-bearing puncture at sides 

 and a second at or in front of the hind angle. Elytra margined at 

 base, sides narrowly reflexed, apex obliquely sinuate, disk striate 

 and in our species with dorsal punctures. Prostemum not pro- 

 longed at tip; hind coxse contiguous. IMales with three joints of 

 front tarsi feebly dilated and clothed beneath with small scales. 

 Four of the five genera occur in Indiana. 



KEY TO INDJANA GENERA OF PLATYNINI. 



a. Eighth elytral stria distant from the margin, not deeply impressed; 

 thorax truncate or emarginate at base. 

 6. Tarsal claws more or less serrate : mentum toothed ; tarsi glabrous 

 above. XXXI. Calathus. 



66. Tarsal claws not serrate. 



c. Mentum toothed. XXXII. Plattnus. 



cc. Mentum not toothed. XXXIII. Olisthopus. 



aa. Eighth elytral stria united with the margin in its basal half, deeply 



impressed atid reaching the suture. XXXIV. Perigona. 



