THE GBOCND BEETLES. 129 



-K'.i (TSUI. I'hATYNr.s KHRANS Sm.v, Jouni. I'hil. A(-ad. Ntit. Sci., ITT, 1S2:1. 

 147; ibid. II, 114. 



Elongate-oval, rather broad. Head ami thoi-ax bluisli-green, elytra 

 with a brassy tinge; under surface black. Thoni.v one-third wider than 

 long, much narrowed behind, hind angles rounded m- obtuse. Blytial stria' 

 narrow, sliallow : intervals fiat. Length 7-S iimi. 



Lake County; rare. June 21. 



2T() (TSc.a). Plat\-nus sibcohdatuh Lee, Agnss. Lake Sup., IS50, l'U5. 



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

 ing the thorax less narrowed liehind 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. 



Nortliem third of State, frequent; Knox County, rare. May 

 3-October 17. Occiirs beneath rubbish along the borders of lakes 

 and marshes. Appears sufiftciently distinct to take specific rank. 



211 (TS7). Pi,ATYNUs MCEEEXM Dej., Spec. Ill, 1S27, 152. 

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



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

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

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



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



212 (788). Platynus tenuis Lee, Proc. Pbil. Acad. Nat. Sci., Isri4. 4S. 

 Elongate-oval, rather slender. Plce(jus or bronzed-black, shining. 



Thorax subrotund, ^^•ider than in the preceding, the margin more narrowly 

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

 iiK£rciis. Elytra one-half wider than thorax, broadly depressed behind 

 llie scutellum ; strite fine, not or very indistinctly punctured; inteiwals 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 collaeis Say, Trans. Amer. Phil. Soc, IV, 1S;i4, 



470; ibid. II, .5.34. 

 Elongate-oval. P>lack with a tinge of purple, shining; tibite 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 

 jjunctured; intervals flat. Length 8.7-9.5 mm. 



Described from Posey County ; more common southward. I 

 have not seen a specimen from the State. 



