THE GROUND BEETLK*. 71 



anitac-eons, finely rugose at base, tlie basal impressions broad, deep, bistri- 

 ate. Elytra about one-half wider than thorax, (he intervals less ronvex 

 than in coxcndix. Length 4.5-6.5 mm. 



Throughout the State ; frequent ; more so in the northern coun- 

 ties. May 1-September 4. Listed as B. nitidulum Dej., which 

 name was preoccupied. Resembles coxendix, but easily separated 

 by the pale legs and green punctures of elytra. 



GKOUP B. 



In this group the dorsal punctures are on the third stria instead 

 of the interval and the humeri are either rounded or subangulate. 

 It includes the Indiana species of Groups V to X of Hayward. 



KEY TO INDIANA SPECIES OF GROUP B. 



it. Eighth stria of the elytra moderately near but distinct from the margin; 

 It. Humeri of elytra subaugnlate ; elytral striae entire. 



c. Elytra with the dorsal punctures large, round impressions; elytra 

 finely siriate, shining. 81. AMERICANUM. 



<-c. Elytra with the dorsal punctures normal. 



<l. Form broad, dilated, depressed; hind angles of thorax obtuse; 



size larger, 0.5-7..! mm. DILATATUM. 



<l<l. Form more or less convex and more slender; hind angles of 



thorax subrectangular ; size smaller, 5.5-6.5 mm. 

 c. Feebly convex ; thorax scarcely narrower at base than apex ; 

 elytral stria? moderately impressed. 82. HONESTUM. 



ee. More convex ; thorax more narrowed behind ; elytral striae 

 more deeply impressed, almost creuulately punctate. 



83. CHALCEUM. 



l>1>. Humeri of elytra rounded; robust, very convex; elytral striae di- 

 lated, the tirst and second entire, the others abbreviated behind; 

 blackish-bronzed, the elytra often tinged with green. 84. NIGEUM. 

 mi. Eighth stria of elytra indistinct from margin; humeri rounded. 



f. Thorax trapezoidal, scarcely convex, the basal fovea with either one 

 stria or with two and the outer one very feeble; legs rufous or 

 dull yellow, the femora rarely darker. 



ff. Basal impressions of thorax with the outer stria small but dis- 

 tinct ; size smaller, 4.8-6.2 mm. 



//. Elytra with five inner stria? only entire; thorax one-half wider 



than long. 85. GUEXI. 



lilt. Elytra with six inner stria? entire; thorax more than one-half 



wider than long ; the elytra less wide as compared with the 



thorax ; color nearly black, tinged with bronze. FUGAX. 



(jg. Basal impressions of the thorax with the outer stria obsolete : 



elytra with six inner stria? entire, their color variable, usually 



dull yellow with darker transverse bands; size larger, 6-8.5 mm. 



TRANSVERSALE. 



