274 Trans. Acad. Sci. of St. Louis. 



associated with Fenwsa, but are scarcely so numerous individu- 

 ally ; the three in my cabinet at present may be readily known 

 as follows : — 



PredomlnatiDg color black or blackish 2 



Predominating color pale 8 



2 — Form stout, parallel, rather convex, polished, black, elytra testaceous 

 near the humeri and very narrowly on the suture posteriorly, the 

 abdomen feebly rufescent toward base; legs paie, the antennae black, 

 with the first three and the eleventh joints paler; vestiture sbort> 

 coarse and rather inconspicuous, not dense ; head nearly as long as wide^ 

 arcuately narrowed behind the large but not very prominent eyes, the 

 punctures extremely fine but much coarser and close toward the base 

 and sides; antennae long, thick, cylindric with obtrapezoidal joints^ 

 attaining the middle of the elytra, the second joint shorter than the 

 third, both elongate, obconic and shorter than the first, the outer joints 

 slightly wider than long; prothorax two-thirds wider than long and one- 

 half wider than the head, the sides broadly rounded, feebly converging 

 and scarcely visibly sinuate toward base, the angles distinct, the surface 

 strongly convex, finely, not very closely and scarcely at all asperately 

 punctate, with a large indentation in the middle before the scutellum, 

 the base broadly, unevenly arcuate; eytra transverse, slightly wider 

 and barely a third longer than the prothorax, the bead along the suture 

 extremely fine, almost obsolete, the humeri narrowly rounded to the 

 prothorax, the punctures slightly coarsa, very close-set, deep and 

 asperate; abdomen distinctly narrower than the elytra, parallel and 

 nearly straight at the sides throughout, the fifth segment bat little nar- 

 rower, the punctures rather large, strong and moderately close-set 

 toward base, becoming gradually very minute and sparse aplcally, the 

 basal impressions wide and rather deep. Length 3.0 mm. ; width 0.87 



mm. Ohio (Cincinnati), —Chas. Dury snturalis n. sp. 



Form similar, the size materially smaller, polished, black as in suturalis 

 throughout, except that the elytra are black but obliquely pale from the 

 humeri to the suture at the middle and thence broadly to apex, also 

 narrowly throughout at the apical margin; punctuation throughout 

 similar but finer, less conspicuous and rather less close- set; head rela- 

 tively larger, distinctly though not very closely punctate toward the base 

 and sides; antennae almost similar but somewhat shorter and thicker, 

 theouter joints slightly more transverse; prothorax similar in general 

 form but only about three- fifths wider than long and scarcely two-fifths 

 wider than the head, the subbasal impression much feebler, shorter 

 and broader; elytra and abdomen similar. Length 2.7 mm.; width 



0.8 mm. Missouri (St. Louis) tristigma n. sp. 



3 — Form rather stouter than in tristigmCt 8hining,pale testaceous in color, 

 the head slightly piceous, the elytra blackish, pale at the humeri and 

 narrowly on the suture posteriorly, the abdomen blackish posteriorly; 

 legs pale, the antennae dusky, paler toward base and at tip; sculpture 

 as in trtMtigma but still finer, feebler and sparser, the punctures of the 

 elytra scarcely at all asperate ; head similar, the antennae barely ex- 



