302 Trans. Acad. Sci. of St. Louis. 



Male with secondary characters nearly as \n perpolita, the carinules near 

 the apex of the fifth tergite generally more subequal among themselves 

 and subequidistant, the two processes from the bottom of the sinus of 

 the sixth tergite parallel, not diverging from the base and usually not 

 quite so approximate ; /emaZe with the sixth tergite very broadly, evenly 

 arcuate at tip. Length 1.4-1.7 mm.; width 0.66-0.76 mm. Colorado 

 (Boulder Co. and Buena Vista) tenebrosa n. sp. 



Body stout, moderately convex, not very highly polished, the entire surface 

 strongly micro-reticulate, uniform dark red-brown in color, the entire 

 abdomen black except at base and apex, the latter slightly paler; head 

 small, feebly punctate, the antennae dark testaceous, the outer joints 

 stout and transverse; prothorax smaller than usual but distinctly wider 

 than the head, three-fifths wider than long,the sides subparallel and broad- 

 ly arcuate, the base arcuate, broadly margined; surface very remotely 

 and indistinctly punctate, the median line narrowly and slightly elevated 

 throughout the length ; elytra two-fifths wider and nearly one-half longer 

 than the prothorax, finely, sparsely and inconspicuously punctured, 

 the humeri well exposed at base; abdomen broad, nearly as wide as the 

 elytra, subparallel, only slightly narrowed at apex; sixth tergite rounded 

 in the female. Male unknown. Length 1.4 mm.; width 0.64 mm. 

 Ontario (Sudbury), — H. F. Wickham snbuiteus n. sp. 



18 — Form rather stout, subpai'allel, convex, polished, micro-reliculate 

 throughout, dark rufo-testaceous in color, the head scarcely darker; 

 elytra dark piceo-flavate, the abdomen with a large blackish cloud at 

 the fourth and fifth tergites; head rather small, convex, feebly, sparsely 

 punctate, the antennae pale throughout, the club loose and stout, the 

 joints transverse; prothorax much wider than the head, nearly twice as 

 wide as long, the sides sensibly converging and broadly arcuate from 

 near the base to the apex, the former broadly arcuate, the punctures 

 remote and small; elytra slightly wider and about a third longer than 

 the prothorax, strongly transverse, finely, sparsely and asperately punc- 

 tate throughout, each puncture with a coarse erect yellow hair; abdo- 

 men at base nearly as wide as the elytra, the sides thence straight and 

 but slightly converging to the apex. Male with two posteriorly inclined 

 acute and conspicuous processes, separated by about a sixth of the en- 

 tire width and midway between base and apex of the fifth tergite, the 

 sixth with two small acute processes in median third at apex, more than 

 median two-thirds of the intermediate space occupied by a large and 

 apically rounded, flat, polished and sculptureless lobe, extending pos- 

 teriorly beyond the line of apices of the lateral processes, with its edges 

 finely reflexed and extending forward onto the surface of the segment 

 in two fine cariniform lines; female with the sixth tergite very broadly, 

 evenly rounded. Length 1.2-1.4 mm.; width 0.52-0.68 mm. Rhode 

 Island (Boston Neck) and Missouri (St. Louis). compacta n. sp. 



Form very stout, convex, polished, feebly micro-reticulate, the elytra and 

 abdomen more strongly, black, the prothorax with a very faint piceous 

 tinge, the elytra almost equally feebly rufescent; head relatively rather 

 small, finely, sparsely punctate, the antennae moderately stout distally, 

 with the joints transverse, five to ten black or blackish In color; pro- 

 thorax much wider than the head, nearly twice as wide as long, the 



