832 Coleopterological Notices, VI. 



humeri narrowly rounded to the prothorax and scarcely tumid, the post- 

 humeral spiniform prominences strongly developed; apex rather narrowly 

 rounded; disk strongly declivous behind from near the middle at an angle of 

 forty-five degrees in profile, with series of very coarse deep rounded punctures 

 separated by polished intervals. Legs moderately coarsely sculptured and 

 clothed sparsely with short silvery hairs. Length 4.0-4.8 mm.; width 2.0- 

 2.6 mm. 



Southern Illinois. 



This species is much smaller and narrower than paludatus, and 

 has the vestiture still shorter and sparser but more evenly dis- 

 tributed. Two specimens. 



The elytra have well marked but narrow epipleurae, extending 

 with equal width from beneath the post-humeral prominences to 

 the sutural angles. The met-episterna are narrow, with the su- 

 ture well marked and the metasternum is rather longer than the 

 first ventral. 



RYSSEMATITS Chev. 



The somewhat numerous representatives of this genus may be 

 separated into two tolerably well defined subgenera, as shown by 

 the following; tabular statement : — 



'o 



Alternate intervals of the elytra carinate. 



Ryssematus in sp. 



Elytra unicolorous throughout and generally black, subglabrous or with the 

 minute hairs only moderately conspicuous and evenly distributed. 

 Elytral carinse more strongly developed ; species larger. 



Prothorax slightly inflated behind, the sides becoming parallel toward 

 base. 

 Elytra dull, the serial punctures narrow, elongate and widely spaced, 

 • becoming linear and very feeble toward apex, the carina? only mod- 

 erately elevated grantlicollis n. sp. 



Elytra rather shining, the serial punctures coarse and somewhat close- 

 set, distinct to the apex, the carina; very strongly elevated. 



lineaticollis Say 



Prothorax not inflated, the sides divergent to the base and never jmrallel; 



pronotal rugie coarse and converging posteriorly toward the middle; 



body much smaller and narrower, the prothorax relatively smaller and 



more conical aniiecteiis n. sp. 



Elytral carinte very feeble, the flat intervals rugose; pronotal rugte coarse 

 and strongly oblique; minute hairs of the elytra quite numerous and dis- 

 tinct; small species aeqiialis Horn 



Elytra pale or mottled, always distinctly pubescent. 



