THE GROUND BEETLES. 



125 



front and behind, the margin rather strongly reflexed ; basal impressions 

 wide, deep, not punctured. Elytral striae shallow, not punctured ; intervals 

 flat, alutaceous. Length 12-13 mm. 



Lake and Posey counties; rare. May 14-May 20. 



203 (769). Platynus cincticollis Say, Trans. Amer. Phil. Soc, II, 1823, 



52; ibid. II, 476. 



Elongate, slender. Piceous black. Thorax widest at middle, more 

 narrowed behind than in front, margins strongly reflexed near the hind 

 angles; basal impressions deep, not punctured. Elytral strife not punc- 

 tured ; intervals slightly convex. Length 9.5-11 mm. 



Throughout the State ; common. Hibernates. February 9- 

 October 29. 



204 (770). Platynus beflexus Lee, Agass. Lake Sup., 1850, 205. 



Resembles cincticollis in form. Distinguished readily by the lighter 

 colored antenna? and legs. Thorax longer, more narrowed behind; side 

 margins more strongly reflexed, as wide in front as towards the base; 

 front angles more prominent. Elytral striae deeper; the intervals a little 

 more convex. Length 9,5-11 mm. 



Laporte, Lawrence and Owen counties; frequent beneath rocks" 

 along streams, especially those within but near the mouths of 

 caves. April 15-November 8. 



205 (9272). Platynus paemaeginatus Ham., Can. Ent., XXV, 1893, 305. 

 Elongate, slender, subdepressed. Reddish-brown; antenna?, legs and 



margin of thorax lighter brown. Thorax about as wide as long, side mar- 

 gins wide, strongly reflexed their full length; front angles prominent, ob- 

 tusely rounded, hind angles obtuse; basal impressions deep, finely and 

 sparsely punctate. Elytral striae deep, not punctured ; intervals subconvex, 

 the third with three or four punctures near the third stria and another 

 near the apex of the second stria. Length 8-10 mm. 



Crawford and Jackson counties; scarce. Occurs beneath stones 

 in channels or shallow ravines on the slopes of high wooded hills. 

 May 16-September 24. 



Geoup C. 



The species of this group are winged, brownish, bluish or 

 greenish in color, with base of antennas, legs and occasionally the 

 thorax, reddish-yellow. The thorax is longer than wide, the mar- 

 gin less strongly reflexed, hind angles obtuse or rectangular. Ely- 

 tra elongate, about twice as wide as thorax, scarcely sinuate near 

 apex, humeri broadly rounded, stria- deep but fine, the intervals 

 nearly flat, the third with three to seven punctures. 



