THE GEOUND BEETLES. 115 



//. One bristle-bearing puncture on margin af tliorax near middle, 

 fir. Smaller. 15-16 mm. ; basal transverse impression of thorax 

 feeble. 183. ovalis. 



gg. Larger, 20-2.5 mm. ; basal transverse impression distinct. 

 h. Form elongate ; margin of thorax reflexed near base. 



184. AMBIGUt'S. 



hh. Foi-m broad; sides of thorax not or but slightly reflexed 

 near base; elytral intervals rather narrovir, convex; hu- 

 meral carina two-thirds the length of elytra. 



185. DIIATATDS. 



&6. Thorax as wide or wider at apex than base. 



/. Surface scarcely shining; thorax decidedly narrowed behind. 



186. TETEE. 



a. Surface shining; thorax nearly square, not narrowed behind; hu- 

 meral carina very short. 187. politus. 



179 (722). Dic^LUs scuutilis Say, Trans. Amer. Phil. 



Soc, II, 1823, 68 ; ibid. I, 53. 



Broad, subconvex. Black, shining ; antennae piceous, paler 



at tip. Thorax very slightly widest at base, the margin ,^rj^cji^^^ 



broad ; disk finely alutaceous, minutely rugose, not punctate, --^liv- ;s|l ': 



1 1' ' S 1^ 

 Readily known by the rough upper surface of the elytra. Vit'' ; '.wA 



Length ]7-19 mm. (Fig. 68.) V^W I 



1 



Southern portion nf State, scarce; not taken north ) i 

 of Wayne and Fountain counties. April 17-October Kg. 68. 



. -, -, (After Say.) 



16. Occurs most commonly in low, damp woods. 



180 (718). Dic.Fxi's puBPURATDS Bon., Mem. Ac. Tor., 1813, 447; Say, I, 51. 

 rurplihh or violaceous, without brassy tinge; antennae 



(as in all the succeeding species) piceous at base, grad- 

 ually paler to apex; legs black. Thorax with fine, wavy 

 transverse lines. Elytra alutaceous, the strise deep ;. in- 

 tervals very convex. Length 20-25 mm. (Fig. 69.) 



This large beetle is one of the most handsome of 

 our Carabidsp. It occurs frequently in southern 

 Indiana, but in the north has been taken only in 

 Kosciusko County. April 6-August 11. 

 Fig. 69. (After Say.) B. splevcUdus Say, 18-25 mm. in length, occurs 

 in Illinois and pos.sibly in western Indiana. 



181 (72.S). Dio^LUS FUEVUs Dej.. Spec, II. 1826, 388. 



Short and rather broad. Blackish, opaque or feebly shining. Thorax 

 as in purpuratus, the median line feeble, the margins but slightly reflexed. 

 Elytra minutely granulate; the interval between the fifth and sixth striae 

 with several punctures near the base. Length 15-16 mm. 



Piitnam. Vigo, Dubois. Posey and Dearborn counties; scarce. 

 March 25-September 16. The humeral carina extends almost to 

 apex and unites at tip with the fifth interval. 



