THE GEOUND BEETLES. 135 



thorax, emarginate at base and obliquely subtruncate at tip, the 

 strise fine ; intervals flat, the third with four to six dorsal punctures. 

 Tarsal grooves indistinct. 



KEY TO SPECIES OF GE0T3P F. 



a. Thorax narrower behind, the side margins more widely reflexed to- 

 ward the base ; autennse with joints 5 to 11, paler. 



233. BLFICOENIS. 



(((/. Thorax elongate-oval, the side margins uniformly narrow. 



6. Antennas piceous; size larger, 7-7.5 mm. 236. gemellus. 



hb. Antennae brownish-yellow ; smaller, 5-6.5 mm. 



c. Thorax black. 234. picipenxis. 



r-c. Thorax brownish-yellow. 235. lutulentds. 



23;:! is31j. Platynls buficoenis Lee, Agass. Lake Sup., 1850, 205. 



ElonKHte, slender. Head and thorax black; elytra piceous, shining; 

 autenn.-i^ and legs browuish-yellow. Thorax oval, distinctly longer than 

 wide, hind angles rounded ; basal impressions broad, rather shallow. Ely- 

 tral stri;u tine, not punctured ; intervals flat, the third with five or six 

 small dorsal punctures, the first three on the' third stria, the others on the 

 >eeond. Length 7-8 mm. 



Frequent along the margin of Tippecanoe Lake, Kosciusko 

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



*234 (834). Platyncs picipennis Kirby, Faun. Bor. Amer., IV, 1837, 25. 

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

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

 row, hind angles rounded ; basal impressions narrow, shallow. Elyti-a 

 elongate, elliptical, the strise of moderate depth, not punctured; intervals 

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



Lake, Vigo, Posey and Kosciusko counties; frequent. January 

 1-October 17. Gregarious in winter. 



*235 (835). Platynds lutulentds Lee, Proc. Phil. Acad. Nat. Sci., VII. 

 1854, 54. 

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

 low, shining. Thorax more flnely margined, basal impressions smaller and 

 less distinct, and elytral striae finer than in the preceding. Dorsal punc- 

 tures four, larger than in pUApcnniH, the first two on third stria, the others 

 on second. Length 5.5-6.5 mm. 



Throughout the State; frequent. Hibernates. Sometimes at- 

 tracted by electric lights. January 21-December 23. 



236 (833). Platyncs gemellus Lee, Bull. Brook. Eut. Soc, II, 1879, 'A. 



Elongate, slender. Piceous ; head and thorax often darker ; epipleura. 



legs and base of antennse dark reddish-brown. Thorax oval, one-third 



longer than wide, side margins very narrow, hind angles obsolete; basal 



