THE GROUND BEETLES. 107 



160 (U(i7). Amaba pkotensa Putz., Mem. Liege, 1, 1866, 183. 

 Oblong-oval, moderately convex. Purplish-black or bronzed, alutaceous 



in botb sexes, more strongly in females ; antennae and legs piceous ; under 

 surface black. Thorax two-thirds wider than long, very distinctly wider 

 at base than apex ; basal impressions very taint not punctured ; hind angles 

 subrectangular. Elytra slightly wider than thorax, finely striate, the stria? 

 smooth. Length 7.5-8.5 mm. 



Laporte County; rare. Slay 20. A species of northern range 

 which probaBly occurs throughout the northern third of the State. 



161 ( 068 ) . Amaba polita Lee, Ann. Lye. Nat. Hist., IV, 1848, 364. 



Oval, moderately convex. Bronzed ov blackish-bronzed, shining, often 

 \vit.h a bluish tinge ; femora black, tibia and tarsi reddish-brown. Thorax 

 nearly twice as wide as long, narrowed from about one-third in front of 

 base, hind angles rectangular; basal impressions small, deep, not punctured. 

 Elytra very slightly wider than thorax, the stria; smooth. Length 6.2-7 mm. 



Lake and Pulaski counties ; scarce. ^March 26-June 26. Easily 

 recognized by the carinate antennse, oblique outer basal depression 

 of thorax and smaller size. 



A. pallipes Kirby. 5.5-8 mm., and A. crassispina Lee, 7.2-9 mm. 

 in length, are members of the boreal fauna ranging from Massa- 

 chusetts to Lake Superior and AVisconsin, and probably occur in 

 the northern counties of Indiana. 



Group C. 



This group of eight species comprises the Indiana members of 

 the subgenus Celia and includes our largest and smallest species of 

 Amara. For the most part they are oval, brown or piceous, rarely 

 bronzed species, having the thorax broadest at base, the hiud tibia; 

 never pubescent on inner side in males, and the oeellate puncture 

 at base of scutellar stria always lacking. 



KEV TO INDIANA SPECIES OF GROUP C. 



a. Antennffi and legs piceous black. 



6. Elytra strongly alutaceous, the intervals more or less uneven. 



162. INTERSTITIALIS. 



1)1). Elytra shining; intervals flat, smooth and even. 163. ebbatica. 



(Id. Antennse pale, legs usuall.v so. 



c. Size very large for the genus, 9-12 mm. ; prosteriunn with a number 

 of setae (bristly hairs) at tip. 164. obesa. 



00. Size medium or small, not over 8 mm. ; prostemum with either two 

 setae or none at tip. 

 d. Presternum of male with an irregular group of small punctures 

 near the middle. 

 e. Sides of thorax distinctly flattened; prostemum with two sefcc 

 at tip; reddish-brown, the males shining. 



165. BEMOTESTBIATA, 



