THE GROUND lUMlTLKS. 115 



//. Otie bristle-beariiiK puncture un inargiu ol' thorax near middle. 

 /;. Smaller. 15-1(; inui. ; basal transverse inipressioti of thorax 

 feeble. 18;j. ovalis. 



//(/. Larger. 20-2.") umi. ; basal transverse impression distinct. 

 7(. Form elongate; margin of thorax reflexed near base. 



184. AMBicrrs. 

 /(/;. Form broad; sides of thorax Udl or but slightly reflexed 



near base; el.vtral intervals rather narrow, convex; hu- 

 meral carin.-i two-thirds the length of elytra. 



185. DILATATrS. 



hh. Thorax as wide or wider at apex than base. 



/. Surface scarcely shining; thorax decidedly narrowed behind. 



186. TETER. 



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

 meral carina very short. 187. polttts. 



170 (722). Dic.^LUS sculptilis Say, Trans. Amer. Phil. 

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

 Bi'oad. subconvex. Black, shining ; antennae piceous, paler 

 at tip. Thorax very slightly widest at base, the margin 

 broad ; disk finely alutaceous. minutely rugose, not punctate. 

 Readily known by the rough ujiper surface of the elytra. 

 Length 17 m mm. (Fig. OS.) 



Southern portion of State, scarce; not taken north 

 of "Wayne and Fonntain counties. April 17-October Fig. 68. 



' (After Say.) 



16. Occni's most eonimonly in low. damp Avoods. 



180 (718). Dic.KLrs plrpuratus Bon., Mem. Ac. Tor., 1813, 447; Say, I, 51. 

 l'nri)lish 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 striae deep ; in- 

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



This large beetle is one of the most handsome of 

 our ("^arahidfp. It occurs frequently in southern 

 Indiana, hut in the north has been taken only in 

 Kosciusko County. April fi-Aug-ust 11. 

 Fig. 69. (After Say.) D. spl(-)ididus Say, 18-25 mm. in length, occurs 

 ill Illinois and pos-sibly in western Indiana. 



181 (72:5). Dic.p:rx-s furvus Dej.. Spec, II. 1826. 388. 



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

 as in purpumtus. 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. 



Putnam. A^igo. 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. 



