THE GROUND BEETLES. 195 



sandy localities. January 10-November 24. Often seen running 



over plowed ground in early spring. 



365 (1181). ANISODACTYLUS CAKBONAEIUS Say, Trans. Ainer. Phil. Soc., II, 



1823, 32 ; ibid. II, 460. 



Elongate-oblong. Male, black, feebly shining ; female, rusty, opaque ; 

 antennas and. legs piceous, tarsi reddish-brown. Thorax slightly broader 

 at base than apex, sides feebly curbed; hind angles obtuse; margins broad- 

 ly depressed near base, finely and sparsely punctulate. Elytral intervals 

 finely alutaceous, slightly convex in male, flat in female; the third punc- 

 tured as in rusticus. Length 12.5-13.5 mm. 



Throughout the state; common, but less so than rusticus. 

 March 19-October 17. 



GROUP B. (ANISODACTYLUS.) 



Oblong species usually shining and glabrous; terminal spur, of 

 front tibse dilated at middle. Elytra striate, the second stria with 

 a distinct dorsal puncture. Males with the front tarsi broadly, 

 the middle tarsi rather feebly, dilated. 



KEY TO INDIANA SPECIES OK GKOUP B. 



a. Black species ; hind tarsi slender, equal to tibise, first joint nearly as 

 long as the next two together; male with first joint of middle tarsus 

 pubescent at tip. 

 &. Clypeus with one bristle-bearing puncture on each side. 



c. Elytra opaque, the strige feeble, especially at tip ; hind angles of 

 thorax obtuse, sides regularly curved, base as wide as elytra. 



366. FUBVUS. 

 cc. Elytra shining in both sexes, more deeply striate. 



d. Elytra oblong, their sides nearly parallel ; intervals feebly con- 

 vex, distinctly but sparsely punctulate, feebly shining. 



367. INTERPUNCTATUS. 



dd. Elytra oval, their sides curved ; intervals convex, smooth ; form 

 more robust, surface shining. 368. AGRICOLA. 



6&. Clypeus with two bristle-bearing punctures each side. 

 c. Hind angles of thorax obtuse. 



f. Side margin of thorax very distinctly depressed, and with the 

 base punctulate. 369. HARKISII. 



//. Side margin of thorax scarcely depressed. 370. NIGERRIMTS. 

 ce. Hind angles of thorax distinct, nearly rectangular. 



fir. Elytra with sides nearly straight, subparallel ; intervals dis- 

 tinctly but sparsely punctulate. 371. NIGRITA. 

 <jg. Elytra with sides distinctly curved; intervals smooth, shining; 

 form more robust. 372. MELANOPUS. 

 ua. Bicolored or metallic species; hind tarsi slightly flattened, shorter than 

 the tibise, first joint but little longer than second ; male with first 

 joint of middle tarsus glabrous beneath. 

 h. Thorax piceous, brownish-yellow at sides; length 11 mm. 



373. DISCOIDEUS. 

 hh. Thorax entirely piceous; length 9-10 mm. 374. BALTIMORENSIS. 



