THE OROITNT) BEKTLES. 127 



lu'jilh old I(ii;s in dry. npl;iiid open woods. In two specimens the 

 intervals lu-r inneh more coarsely pnnctnred, more convex and 

 strongly ahitacoous. 



*20S (7S4). Platynus rrsiiu .s Lee, Proc. Phil. Acad. Nat. Sci., VU. 

 1854, 39. 

 Elongate, very slender. Head and thorax iMeeous, the elytra usually 

 reddish-brown; antenmy and legs light brown. Thorax long and cordale; 

 base much narrowed, subcylindrical ; impressions elongate and narrow, 

 hind angles rectangular; median line deep, surface sparsely and rather 

 coarsely punctured. Elytra twice as wide as thorax, tips rounded, stria- 

 deep and finely punctured. Tvengtli C 7 mm. 



Throiio-hont the f^tate : froqnont. Hibernates. January 21- 

 September 11. 



Gkoup D. 



A larsje ;2:ronp of winged species, nsnally black, the legs and an- 

 tennae sometimes of the same hue, more often pieeous or reddish- 

 brown. Thorax rounded, the margin nsnally slightly widened and 

 reflexed toward the base, hind angles very obtnse or altogether 

 I'onnded. basal impressions variable, either broad and shallow or 

 deep and narrow, sometimes almost obsolete. Elytra often not 

 much, wider than thorax, humeri broadly rounded, the base trun- 

 cate or subemarginate, tips rounded and hardly sinuate; intervals 

 mostly flat, the third with three to seven punctures. Tarsi with 

 distinct lateral but no medial grooves. 



KEY TO SPECIES OF GROUP D. 



(I. Thorax transversely oval or rounded, rarely subquadrate; elytra not 

 deeply emarginate at base. 

 b. Either black (rarely bronzed), or green with disk of elytra cu- 

 preous; hind angles of thorax usually much rounded. 

 c. Dorsal punctures three. 

 d. Antennae, and usually the legs, wholly black or pieeous. 



e. Thorax with side margins wider and strongly reflexed near 

 the base. 

 f. Elytral stritie fine, the intervals flat. 

 (J. Hind angles of thorax obtuse, rather distinct. 



211. MCERENS. 



Off. Hind angles of thorax entirely rounded. 212. tenuis. 



ff. Elytral strise deep, the intervals more or less convex. 



/(. Elytral stria* strongly punctured: hind angles entirely 

 rounded. 213. coliaris. 



hh. Elytral striae not or feebly punctulate. 



i. Hind angles of thorax entirely rounded: elytral inter- 

 vals distinctly convex. 214. .\tratus. 

 [9—23402] 



