168 



FAMILY II. CABABIDiE. 



308 (1Q3.1 ) . Ohl^enius pubpt eicollts Rand., Rost. Journ. Nat. Hist., IT, 

 1838, 35. 



Oblong-oval. Dark violet blue above, black beneatb ; antennae black, 

 basal joint pale. Thorax gradually narrower from base to apex, surface 

 coarsely and very irregularly punctured, the sides in front of middle almost 

 smooth. Elytral striae very fine, distantly and finely punctured; intervals 

 flat with numerous rather coarse, simple punctures. Length 8.5-9.5 mm. 



Lake and Laporte counties ; rare. May 14- August 26. Occurs 

 along the beach of Lake Michigan. 



304 (1029). Chi^enius nigee Rand.. Bost. Journ. Nat. Hist., II, 1838, 34. 

 Broadly oval. Uniform black throughout; head and thorax shining. 



Thorax one-third broader thair long, apex narrower than base, hind angles 

 obtuse; basal impressions deep; disk coarsely punctured, with irregular 

 smooth spaces each side of middle. Elytral striae finely punctured; inter- 

 vals convex, rather densely and roughly punctured. Length 11.5-12.5 mm. 



Lake, Vigo and Knox counties; scarce. April 5-July 9. 



305 (1025). Chl.enius impunctifeons Say, Trans. Amer. Phil. Soc, II, 



1823, 64 ; ibid. II, 486. 

 Elongate-oval. Head bright green; thorax blackish-green, subopaque; 

 elytra black; antennae and legs pale reddish-brown. Thorax broader than 

 long, very flat; base as broad as elytra, hind angles obtuse. Elytral striae 

 rather deep, finely punctured; intervals flat, finely and roughly punctate. 

 Length 13.5-16 mm. 



Throughout the State; scarce. April 16-August 26. Easily 

 known by the very flat thorax with a narrow pale margin. 



*306 (1021). Chl^nius pennsylvanicus Say, Trans. Amer. Phil. Soc, II, 

 1823, 66; ibid. II, 487. 

 Elongate-oval, slender. Head and thorax bright green ; elytra darker 

 green; antennas reddish-brown, three basal joints paler; under surface 

 black, legs pale. Thorax slightly wider than long, sides moderately curved, 

 feebly sinuate near base; disk convex, coarsely and rather sparsely punc- 

 tate; basal impressions linear, deep. Elytral striae deep, rather coarsely 

 punctured; intervals flat, muricate. Length 10-11.5 mm. 



Throughout the State ; more common in the northern half, 

 where it often occurs in small colonies beneath rubbish along the 

 margins of lakes. January 3-October 13. 



307 (1019). Chl^enius bkevilabeis Lee, Ann. Lye Nat. Hist., IV, 1848, 

 437. 



Form and color of pennsylvanicus. Elytra bluish-black, the intervals 

 flat, finely and indistinctly punctured. Length 10-12 mm. 



