832 Coleopterological Notices, VI. 



humeri narrowly rounded to the prothorax and scarcelj- 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, Avith series of very coarse deep rounded punctures 

 separated by polished intervals. Lcg>t 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 narrow^er than paludatus, and 

 has the vjestiture 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 nari-ow, with the su- 

 ture well marked and the metasternum is rather longer than the 

 first ventral. 



RYSSEMATIIS Chev. 



The somewhat numerous representatives of this genus may be 

 separated into two tolerably well defined subgenera, as show-n by 

 the following tabular statement : — 



Alternate intervals of the elytra carinafe. 



Ryssematus in sp. 



Elytra unicolorims throughout and generally black, subglahrous or with the 

 minute hairs only moderately conspicuous and evenly distributed. 

 Elytral carinas more strongly developed; species larger. 



Prothorax slightly inflated behind, the sides becoming parallel toward 

 base. 

 Elj'tra dull, the serial punctures narrow, elongate and widely spaced, 

 becoming linear and verj^ feeble toward apex, tlieoarin;e only mod- 

 erately elevated gl'iiiiclicollis n. sp. 



Elytra rather shining, the serial i)iinctures coarse and somewhat close- 

 set, distinct to the apex, the carin;e very strongly elevated. 



liiieaticollis Say 



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



pronotal rugne coarse and converging jiosteriorlj' toward the middle; 



body much smaller and narrower, the prothorax relatively smaller and 



more conical aiiiiecleiis n. sp. 



Elytral carinie very feeble, the Hat intervals rugose; pronotal riigix; coarse 

 and strongly obliiiue; miiuite hairs of the elytra (juite numerous and dis- 

 tinct; small species aeqiialis Horn 



Elytra pale or mottled, always distinctly pubescent. 



