THE GEOUXD BEETLES. 



131 



depressions narrow, and shallow. Elytra] striae tine, not punctured: in- 

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



Throughout the northern part of the State: frequent. Not 

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

 ber 24. 



219 (802). Platthus excatatus Dej., Spec. III. 1827, 169. 



Elongate, rather slender. Piceous bronzed, shining; base of antennae 

 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. Elytra! striae fine, not or in- 

 distinctly punctured: intervals fiat. Length 7-7.5 mm. 



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

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

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

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

 near second. 



220 (803). Platyxus febbeus Hald.. Proc. Phil. Acad. Nat. SeL, I. 299. 

 Elongate, slender. Head and thorax greenish-black : antennae piceous. 



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

 Elytral stria- deep and strongly punctured on basal half : more faint and 

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



Clarion. Lawrence. Knox and Posey counties: one specimen 

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



221 (804). Platyxus basaeis Lee. Ann. Lye. IT. 1848. 227. 

 Elongate, slender. Head and thorax blackish-bronzed : elvtra bronzed 



green., shining; antennae piceous. 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 punctata Elytral stria? 

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



Vigo and Posey counties : scarce. Hibernates. May 21-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 extensicoUis but the basal impressions of 

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

 wider at base. 



*222 ( 805 ). Platyxus xutaxs Say. Trans. Amer. Phil. Soc.. II. 1823, 52: 

 ibid. II. 176. 



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

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

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



