THE GROUND BEETLES. 



167 



(tROUP B. 



The species of this group are, as a rule, much smaller than those 

 of Group A. The males are without a pubescent space at tip of 

 middle tibia?, and the third joint of antenna? is almost always equal 

 to or shorter than the fourth. 



KEY TO I-NDIAJNA SPECIES OF GROUP B. 



a. Abdomen without punctures and glabrous; thorax as broad at base as 

 elytra, sides in it sinuate, basal impressions; very feeble, surface dense- 

 ly punctured. 302. tomentosus. 

 (ia. Abdomen sparsely punctured and pubescent ever the entire surface. 

 h. Sides of thorax not sinuate: presternum not margined at tip. 



c. Legs black; thorax as wide at base as elytra, its disk with coarse 

 punctures very irregularly placed. 

 d. Margin of thorax not thickened: basal line angulate at humerus: 

 purplish or violet blue above : length S.5-9.5 mm. 



303. PURPURICOLLIS. 



dd. Margin of thorax thickened near base: humeri of elytra rounded: 

 black above: length 11 .5-12.5 mm. 304. xiger. 



cc. Legs reddish-yellow; thorax more finely and densely punctured, 

 narrower at apex than base and with a narrow red margin. 



305. EMPUXCTIEROXS. 



hh. Sides of thorax distinctly sinuate: presternum margined at tip, its 

 side pieces coarsely punctured. 

 c. Elytral intervals finely muricate: i. e.. with numerous fine, rigid 

 points. 306. pennsylvanicus. 



cc. Elytral intervals finely and sparsely punctured, not muricate. 

 /. Head and thorax green, varying to blue, shining. 

 g. Labrum feebly emarginate : elytra very obsoletely and sparsely 

 punctate. 307. brevilabbis. 



gg. Labrum truncate. 30S. tricolor. 



ft. Plead and thorax coppery bronze: thorax alutaceous, subopaque, 

 more finely and sparsely punctate. 309. xemoraljs. 



302 (1032). Chlemus toxiextoscs Say. Trans. Amer. Phil. Soc. II. 1S23. 

 60: ibid. II. 183. 

 Broadly oval, robust. Blackish, purplish or greenish and 

 feebly bronzed above: antennre black, two basal joints pale, 

 the third joint longer than fourth : under surface and legs 

 black, shining. Head nearly smooth, a few wrinkles and 

 punctures above each eye. Thorax gradually broader from 

 apex to base, disk densely and coarsely punctured, with a 

 few irregular smooth spaces. Elytral striae shallow, punc- 

 tures round, rather coarse: intervals feebly convex, finely 

 punctulate and pubescent. Length 13.5-15 mm. (Fig. 90. ) 



Fig. 90. X li. 



Throughout the State: common. March 23— Novem- (Original., 

 her 20. Often found at electric light and probably hibernates. 

 The abdomen is sometimes sparsely punctured on the sides. 



