'I'lTi'; (MtorM' iiiM'.rLHS. 



135 



Ihoi'iix, ('iii;ir'jin:i1c nt bnsc iiiul (ililii|url.\- suhl iMiiiciilc a1 lip, the 

 striivfiue; inti'fvals Hat. the lliird wilh Iniir to six dorsal i)un«'1ures. 

 Tarsal o-rooves indistinct. 



KKY TO SPECIES OF GROUP F. 



(/. Tliorax naridwcr li"liiii(l. tlie side in:ir,iiiiis more widcl.v n-llcxed to- 

 ward tlie Itase; :iiitt'iui;i-' witli .ioints 5 to 11, paler. 



2:53. 151 I'lCOKMS. 



iKi. 'I'lKir.MX I'loiiuatr-.ival. llic sidf iiiai'iriiis nnilonnly narrow. 



h. Antenna" pieeous; size larger. 7-7.5 mui. 236. oemkixus. 



III). .Vnt('niia> Irrownlsli-yellow ; smaller, 5-0.5 mm. 



c. Tliorax black. 234. pku'Ena'is. 



re. Thorax browuisli-.v(>ll(>w. 235. LiTiLENTrs. 



1':!;', (S3t). Pl.\tynus ruficorms Lee, Agass. Lake Sup., 1850, 205. 



Elongate, slender. Head and tliorax black; elytra piceous, shining; 

 .•iiitenii;r and legs brownish-yellow. Phorax oval, distinctly longer than 

 wide, iiiiid angles rounded: liasal impressions broad, rather shallow. VAy- 

 iral stria' line, not punctured: intervals tlat, the third with five or six 

 small (hirsal punctures, the first three on the third stria, the others on the 

 second. Length 7-8 mm. 



Frequent along the margin of Tippecanoe Lake, Kosciusko 

 ( Vumty ; Lake and Posey counties ; scarce. March 26-October 21. 



*2o4 (834). Pi^vTYNL'S piciPKNNis Kirliy. Faun. Kor. Amer., IV. 1837, 25. 

 Elongate, very slender. Head and thorax black; antenme. legs and 

 elytra brownish-yellow. Thorax oval, about as long as wide; margin nar- 

 row, hind angles rounded: l>asnl impressions narrow, shallow. Elytra 

 elongate, elliptical, the stria- of moderate deiith, not punctured; intervals 

 nearly flat, the third with four to six dorsal punctures. Length 6-7 mm. 



Lake. Vigo, Posey and Kosciusko counties: frecjuent. January 

 1 -October 17. Gregarious in winter. 



*2.35 (835). Platynus lutulentus Lee, Proc. Phil. Acad. Nat. Sci.. VIL 

 1854, 54. 

 Elongate, very slender. Head black; remainder of body brownish-yel- 

 low, shining. Thorax more finely margined, basal im])ressions smaller and 

 less distinct, and olytral stri.e finer than in the preceding. Dorsal punc- 

 tures four, larger than in ijiciiHiuiix. the first two on (liird stria, the others 

 cm second. Length 5.5-6.5 mm. 



Throughout the State; frequent. Hibernates. Sometimes at- 

 tracted by electric lights. January :21-December 23. 



236 (833). PuvTYMs gkmklias Lee. Bull. Brook. Ent. Soc.. II. 1S7!». .".4. 



Elongate, slender. Piceous; head and thorax often darker: eidpleura. 



legs and base of antenna> dark reddisli-iirown. Thorax oval, one-third 



longer than \\id(>. side margins verv nan-ow, hind angl(>s obsolete; basal 



