THE GEOUXD BEETLES. 



129 



209 i F86). Platynus errans Say. Journ. Phil. Acad. Nat Sci.. HI. 1823, 



147: ibid. II, 94. 



Elongate-oval, rather broad. Head and thorax bluish-green, elytra 

 with a brassy tinge: under surface black. Thorax one-third wider than 

 long, much narrowed behind, hind angles rounded or obtuse. Elytral stria? 

 narrow, shallow: intervals flat. Length 7-s mm. 



Lake County : rare. June 21. 



210 (786a). Platynus subcordatus Lee, Agass. Lake Sup.. 1850, 205. 

 Differs from the preceding by the characters given in key and by hav- 

 ing the thorax less narrowed behind and the basal impressions more dis- 

 tinctly punctured. The elytra are proportionally broader, the intervals 

 very slightly convex and more distinctly alutaceous. Length 7.5-S.5 mm. 



Northern third of State, frequent : Knox County, rare. May 

 3-Oetober 17. Occurs beneath rubbish along the borders of lakes 

 and marshes. Appears sufficiently distinct to take specific rank. 



211 (787). Platynus mcerexs Dej.: Spec. III. 1827, 152. 

 Elongate-oval, rather slender. Piceous black. Thorax subrotund. a 



little wider than long, basal impressions broad, shallow, hind angles ob- 

 tusely rounded. Elytral striae not punctured, the second puncture on third 

 interval close to second stria. Length S-8.5 mm. 



Starke. Vigo and Knox counties ; rare. July 6-Oetober 8. 



212 (788). Platynus tenuis Lee. Proc. Phil. Acad. Nat. Sci., 1854, 4S. 

 Elongate-oval, rather slender. Piceous or bronzed-black, shining. 



Thorax subrotund. wider than in the preceding, the margin more narrowly 

 yet distinctly reflexed. the base and hind angles more rounded than in 

 mcerens. Elytra one-half wider than thorax, broadly depressed behind 

 the scutellum: stria? fine, not or very indistinctly punctured: intervals flat 

 or slightly convex. Length 9-9.5 mm. 



Laporte, Marshall and Kosciusko counties, scarce; also in 

 "Webster collection. August 17-October 29. In this and the next 

 three species the second dorsal puncture is on or near the third 

 stria. 



213 ( 789). Platynus coliaris Say. Trans. Anier. Phil. Soc.. IV. 1S34. 



470; ibid. II. 534. 



Elongate-oval. Black with a tinge of purple.' shining : tibia? and tarsi 

 piceous. Thorax subquadrate. wider than long, the margins narrow in 

 front broader and strongly reflexed toward the hind angles, which are 

 very obtuse. Elytra with acutely impressed stria?, strongly and regularly 

 punctured; intervals flat. Length S.T-9.5 mm. 



Described from Posey County: more common southward. I 

 have not seen a specimen from the State. 



