THE GKOUXD BEETLES. 133 



Throughout the State; common. Hibernates. (Iregarious in 

 cold weather. January 1-November 24. 



P. crenuhttus Lee, 5.5-6 mm. in length, is a member of the 

 Austroriparian fauna, which may occur in the southern counties. 



*227 (821). Platyni's bogemanni Gyll., Ins. Suec, III, 1810, 697; oUo- 

 letus Say. II, 481, 

 Elongate, slendei-. Black or piceovis. shining. Thorax heart-shaped. 

 wider before the middle, rounded to a narrow base. Elytra oblong, twice 

 as wide as thorax, striie very fine or obsolete, not punctured ; third inter- 

 \&\ with three very small dorsal punctures. Length .5.5-6.5 nmi. 



Lake, Putnam and Vigo counties; scarce. Hibernates. Janu- 

 ary 14-July 28. 



Gboup E. 



A small group of winged species in which the thorax is rounded 

 oval or slightly cordiform, narrowly margined, hind angles obtuse 

 or rounded, basal impressions usually deep and punctiform ; elytra 

 nearly or quite twice as wide as thorax, with punctured striae and 

 three (rarely four) dorsal punctures placed along the middle of 

 the third interval. 



KEY TO SPECIES OF GROUP E. 



II. Tarsal grooves present. 



6. Piceous bronze ; strice of elytra ver\' fine ; tarsal grooves on first 



joint 228. jebuginosus. 



Jih. Black, legs brown ; striaj feebly punctured ; tarsal grooves on first 



and second joints. 232. punctiformis. 



nil. Tarsal groo^'es wanting. 



r. Black or dark reddish-brown; base of antennse. palpi, legs and sides 

 of elytra brownish-yellow. 229. limbatus. 



ec. Black, legs reddish-yellow or reddish-brown. 



rl. Elytral stria coarsely punctured ; larger, 7.5-8 mm. 



2.S0. CRENISTRIATtlS. 



(111. Elytral striae finely punctured ; smaller, 6.2-7 mm. 



231. KIBRIPES. 



*228 (824). Platynus ^^EBtjQiNOStTs Dej., Spec. Ill, 1827, 168. 



Elongate, very slender. Head and thorax piceous ; antennae, elytra and 

 legs dark brown, bronzed, shining. Thorax oval, convex, very narrowly 

 margined ; basal impressions very small or obsolete. Elytra oval, convex, 

 eniarginate at base; striie finely jpunctate: intervals flat. Length 5.5-6 mm. 



Throughout the State ; common. Occurs in damp localities. 

 Hibernates. April 3-December 18. 



229 (S2.'i). Platy.xus Li.MiiATi's Say. 'lYans. .\nier. I'hil. Soc. II. 182.3. 49; 

 Ibid. II. 47:;. 



Elongate, rather robust. Color as given in key. Thorax subrotund, 

 margin very narrow, hind angles wholly rounded ; basal impressions small. 



