THE GROUND BEETLES. DI1 



depressions narrow and shallow. Elytrul striae tine, not punctured; in- 

 tervals flat. Length 7.5-9.5 mm. (Fig. 78.) 



Throughout the northern part of the State; frequent. Not 

 taken south of Vigo County. Hibernates. January 6-Novem- 

 ber 24. 



219 (802). PLATYNUS EXCAVATUS Dej., Spec. Ill, 1827, 169. 



Elongate, rather slender. IMceous bronzed, shining; base of antenna; 

 and legs dull reddish-brown. Thorax about as long as wide, but slightly 

 narrowed behind, sides regularly rounded: basal impressions narrow, deep, 

 punctured ; hind angles obtusely rounded. Elytral striae fine, not or in- 

 distinctly punctured; intervals flat. Length 7-7.5 nun. 



Lake, Laporte, Marion, Putnam and Vigo counties; frequent. 

 April 4-October 17. Occurs on sand and gravel bars of lakes and 

 streams. The dorsal punctures are larger than in any of our spe- 

 cies except octopunctatiis, the first near third stria, the other two 

 near second. 



220 (803). PLATYNUS FERREUS Ilald., Proc. Phil. Ac-ad. Nat. Sci., I, 299. 



Elongate, slender. Head and thorax greenish-black ; antennae pic-eons. 

 Thorax oval, nearly as long as wide, sides rounded, hind angles obtuse. 

 Elytral stride deep and strongly punctured on basal half ; more faint and 

 less distinctly punctured towards the apex. Length 7-7.5 mm. 



Marion, Lawrence, Knox and Posey counties; one specimen 

 from each. March 21-August 28. Occurs near water. 



221 (804). PLATYNUS BASALTS Lee., Ann. Lye., IV, 1848, 227. 



Elongate, slender. Head and thorax blackish-bronzed; elytra bronzed 

 green, shining; antennae pic-eous, the basal joints and legs reddish-yellow. 

 Thorax a little longer than wide, narrowed toward the base, hind angles 

 rounded; basal impressions small, deep, finely punctate. Elytral stri;e 

 rather deep; intervals moderately convex. Length 7-7.5 mm. 



Vigo and Posey counties ; scarce. Hibernates. May 24-Decem- 

 ber 18. The dorsal punctures are small and the second and third 

 vary much in position, though LeConte says they are placed on the 

 second stria. Resembles extensicollis but the basal impressions of 

 thorax much shorter, rounded instead of elongate, the margin not 

 wider at base. 



*222 (805). PLATYNUS NUTANS Say, Trans. Arner. Phil. Soc., II, 1823. 52; 

 ibid. II, 476. 



Elongate, slender. Head and thorax bronzed green; elytra blackish- 

 green or cupreous. Thorax oval, a little longer than wide, margin nar- 

 rowly reflexed, more strongly toward the hind angles, which are rounded ; 



