Til!'] IJ1STEK BEETLES. 617 



tate, the first and second strife very short, basal. Front tibite with four 

 teeth. Length 2 mm. 



Throughout the State; frequent, Hibernates beneath the bark 

 of walnut, poplar and elm logs; on tree fungi in summer. Febru- 

 ary 10-September 21. 



1181 (3567). PAROMALVS SEMINULUM Erichs.. lor. cit. 



Oval, rather convex. Piceous black, shining. Thorax as in hixtn'titiix. 

 Elytra more coarsely punctured than thorax, with traces of two stria 1 at 

 base, and a short, faintly impressed sntnral stria at middle. Length '_' nun. 



Southern half of State; scarce. Occurs with the preceding and 

 may be sexually different only. Hibernates. February 10-Octo- 

 ber 4. 



Atuipleus marginatus I ec., broadly oval, piceous. coarsely punc- 

 tured, elytra with traces of third dorsal stria at base, length !.;"> 

 mm., is known from Illinois and the District of Columbia. 



Tribe III. SAPRINI. 



The different genera of this tribe vary much in size and form. 

 but all agree in la-king a lobe on the front of the prosternum. The 

 members of the largest genus, X<tj-i)nis, live mostly in carcasses. 

 especially those of dead fish along the shores of riveis and lakes. 

 The others occur mostly beneath bark and stones. Six of the seven 

 genera are represented in the State. 





 KEY TO THE INDIANA GENERA OF SAPIilNI. 



or. Antenna? inserted under the margin of the front, in repose received in 

 cavities at the sides of the prosternum: size larger, 2.5 or more mm. 



VIII. SAPRINUS. 



(/r/. Antenna- inserted on the front, in repose received in cavities beneath 

 the sides of the thorax in front, of the coxre ; size usually very small. 

 /). Eyes finely granulated, not prominent; length 1.5-2 mm. 



c. Thorax with deep lateral groove; prosternum deeply bisulcate ; 



tibia- not toothed. IX. PLEGADERIS. 



cc. Thorax without deep lateral groove; form cylindrical: tibiae 



toothed. X. TERETRIUS. 



&&. Eyes coarsely granulated and very convex; form oval; length less 



than 1.5 mm. 



fl. Hind tarsi 5-jointed; scnlellum invisible. XI. HACA.NHS. 



<J<J. Hind tarsi 4-jointed. 



e. Scutellnm distinct. XII. ACRIH s. 



cc. Scutellum invisible. XIII. . 



VIIL SAPRINTS Kridis. 1S:U. (Gr., "rotten.") 



The members of this genus resemble in form those of the larger 

 species of Tlistcr, but almost all of them have the thorax a-id elytra, 

 in part, at least, more coarsely puix-taie. The fifth dorsal stria 



