3oo MEMOIRS ON THE COLEOPTERA 



narrowing only apically, the apices rather broadly truncate and 

 acutely bidentate, the sutural tooth small, the outer moderately long 

 but not acicular, less than three times as long as wide and two-fifths 

 wider than the prothorax, the punctures coarse but widely separated 

 basally, denser toward the sides, very fine apically. Length 17.5 



mm.; width 5.0 mm. Missouri flumineus n. sp. 



Moderately large, though smaller than the preceding and rather narrower 

 in form, blackish-piceous, slightly shining, the short stout decumbent 

 hairs aggregated into dense irregular clusters, the erect hairs of 

 the elytra numerous, rather long but not conspicuous; head not 

 densely puncto-rugose, the antennae (cf ) very nearly as long as the 

 body, rather stout, the third joint a little less than one-half longer 

 than the fourth, or ( 9 ) four-fifths as long as the body but otherwise 

 nearly similar; prothorax subsimilar in the sexes, about a third 

 wider than long, with parallel, unevenly rounded sides, the fine con- 

 striction behind the apical margin deep and acute, the punctures 

 between the callous areas very coarse, deep and rather uneven; 

 elytra nearly as in the preceding, except that the feebly sinuate apical 

 truncatures are bounded externally by a long slender spine, the 

 sutural spine small but aciculate; fifth ventral (cf ) slightly longer 

 than the fourth and evenly, rather broadly rounded, or ( 9 ) nearly 

 one-half longer than the fourth and more narrowly rounded, not 

 barely at all longer than the fourth and more broadly rounded as in 

 flumineus. Length (cf, 9) 11.8-15.8 mm.; width 3.0-4.4 mm. 



Pennsylvania incertus Newm. 



A Similar to the preceding in every way but smaller and less stout, 

 with the antennae much more slender and with the very moderate 

 spines not thick and directed strongly outward as in incertus, 

 but thin and much more axial in direction; pronotal punctures (9 ) 

 still coarser and more uniform in size, the callous spots nearly 

 similar, except that on the outer slope of the antero-sublateral 

 spots there is a large shallow rounded pit; elytra similar but about 

 three times as long as wide, the sinuato-truncate apices similar and 

 with the sutural projection very small, the lateral being rela- 

 tively much longer, very slender and spiculiform; erect hairs not 

 more numerous but paler and more conspicuous. Length (9) 



13.0 mm.; width 3.4 mm. Wisconsin externus n. subsp. 



Very small in size, more cylindric, pale red-brown, feebly shining; head 

 not densely but irregularly sculptured; antennae (cf) shorter than 

 the body and unusually stout, very pale, pubescent, the spines 

 small, not very divergent, the fourth joint scarcely more than twice 

 as long as wide; prothorax nearly as in incertus but with the coarse 

 yellowish decumbent hairs much closer, almost concealing the sculp- 

 ture, which is nearly similar, the sides less rapidly rounding to the 

 feebly constricted apical margin; elytra nearly similar in general form 

 but only a little more than twice as long as wide and but about a 

 fifth wider than the prothorax, differing from either of the two pre- 

 ceding forms in having the coarse decumbent yellowish hairs uni- 

 formly denser and less aggregated into dense clusters and in having 

 the deep and relatively still coarser punctures closer,- more impressed 



