THE HISTER BEETLES. 625 



gi'oove on each side and also, usnally. a transverse impression which 

 divides it into two unequal parts. Of the nine species known from 

 the United States, one has been taken in Indiana, while another 

 may occur. 



KEY TO INDIANA SPECIES OF PLEGADERUS. 



u. Elytra with strlgose confluent punctures. 1199. teansversvs. 



ua. Elytra with coarse rounded punctures; body beneuth coarsely and rather 



closely punctate. sayi. 



1199 (3633). PtEGADEBUS TRAKsvEiisus Say. Journ. Phil. Acad. Nat. Sci., 



V, 1S25, 45 ; ibid. II, 270. 

 Oblong-oval, subdepressed. Brownish-black, moderately shining. Tho- 

 rax slightly broader than long, the side margins convex with a narrow and 

 deep marginal stria on outer side and a deep lateral groove on inner; the 

 disk divided unequally by ,i moderately impressed transverse groove, the 

 front portion smaller and more closely punctured than the hinder. Elytra 

 with elongate, confluent piinelnres and a short, moderately impressed, 

 oblique humeral stria. Length 1.:!-1..j mm. 



Taken in small numbers l)y AVdleott from beiieath the bark of 

 the Norway pine, near Clarke Junction, Lake County, and Dune 

 Park, Porter County. June 27-July 2o. Oe urs from Canada to 

 Texas. 



P sayi ]Mars., brownish, length 1,5 mm., is recorded from the 

 ":Middle States." 



X. Teeetrius Erichs. 1834. (Gr., "cylindrical -i- form.") 



Small subeylindrical beetles having the prosternum emarginate 

 at tip, receiving the inesosternum, the tibite toothed. Three species 

 are known from the United States, one of which occurs in Indiana. 



1200 (3640). TERETRirs ajiericanus Lee, rroc. Phil. Acad. Nat. Sci., XT, 



iS5'..>. .-.ik;. 



Oblong, subeylindrical. Piceous-black, shining, the narrow margin of 

 elytra reddish. Thorax lon^'i^r than wide, flncl.x- punctured ; marginal stria 

 entire but fine and very close to the margin. Elytra without strite. sparsely 

 and rather coarsely punctured, the punctures e(.;u-ser at Imse: truncate at 

 ajiex. Front tibiffi with five or six Hue teeth. I.enf;lli l.."i-2 mm. 



Dubois and Posey eoniilies; rare. May 5-M;iy l-k Taken lie- 

 neath the bark of soft majile and by sifliiiK rotten debris. Widely 

 distributed but scarce. 



XI. Bacanius Lee. 1S53. (Gr.. "radish seed.") 



]\Iinute brownish-red species possessing the characters given in 

 generic key and having the first joint of antenna^ gradually thicker 

 to tip, second joint broader than long, third longer than the two 



