THE HISTER BEETLES. 



625 



groove on each side and also, usually, 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 PLEGADEKUS. 



a. Elytra with strigose confluent punctures. ■ 1199. transversus. 



a a. Elytra with coarse rounded punctures ; body beneath coarsely and rather 

 closely punctate. sayi. 



1199 (3633). Plegaderus transversus Say, Journ. Phil. Acad. Nat. Sci., 



V, 1825, 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 a moderately impressed transverse groove, the 

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

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

 oblique humeral stria. Length 1.3-1.5 mm. 



Taken in small numbers by Woleott from beneath the bark of 

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

 Park, Porter County. June 27-July 23. Occurs from Canada to 

 Texas. 



P. sayi Mars., brownish, length 1.5 mm., is recorded from the 

 ''Middle States." 



X. Teretrius Erichs. 1834. (Or., "cylindrical + form. ") 



Small subcylindrical beetles having the presternum emarginate 

 at tip, receiving the mesosternum, the tibiae toothed. Three species 

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



1200 (3640). Teretrius americanus Lee, Proc. Phil. Acad. Nat. Sci., XI, 



1859, 316. 



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

 elytra reddish. Thorax longer than wide, finely punctured ; marginal stria 

 entire but fine and very close to the margin. Elytra without stria?, sparsely 

 and rather coarsely punctured, the punctures coarser at base; truncate at 

 apex. Front tibiae with five or six fine teeth. Length 1.5-2 mm. 



Dubois and Posey counties; rare. May 5-May 14. Taken be- 

 neath the bark of soft maple and by sifting rotten debris. Widely 

 distributed but scarce. 



XI. Bacanius Lee. 1853. (Gr., "radish seed.") 



Minute 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 



