284 Trans. Acad. Set. of St. Louis. 



visibly wider than the prothorax but distinctly longer, though less 

 elongate than in pinalica, finely, rather closely punctate, the humeri 

 feebly exposed in the reentrant angle between the prothorax and elytra; 

 abdomen evidently narrower than the elytra, subparallel. Male with 

 the lobe of the sixth tergite smaller than usual, parallel, broadly 

 rounded at the sides of the apex, emarginate in median two-fifths, the 

 notch parallel and straight at the sides and feebly sinuate at the bottom, 

 deeper than wide; fifth tergite with two feeble cariniform tubercles on 

 the disk and separated by one-half the total width of the plate. Length 

 1.0 mm.; width 0.4 mm. Mexico (Puebla) azteca n. sp. 



11 — Body moderately stout, convex, compact as usual, shining, dark piceo- 

 castaneous throughout, the legs and antennae pale flavate; integuments 

 micro- reticulate, the head and pronotum obsoletely so; head rather 

 large, very minutely, sparsely punctulate; prothorax twice as wide as 

 long, distinctly wider than the head, the sides strongly rounded, the 

 base strongly arcuate, subtruncate at the middle, the surface minutely, 

 sparsely punctulate throughout, not impressed; basal border strong at 

 the middle; elytra slightly wider and distinctly longer than the pro- 

 thorax, finely, asperately and closely punctate, the humeri but little 

 exposed ; abdomen distinctly and regularly narrowed from the base, 

 where it is nearly as wide as the elytra, to the apex, the sides nearly 

 straight. Male with two very small slender posteriorly inclined, setig" 

 erous and spiniform processes just behind the median transverse line 

 of the fifth tergite, separated by about a fourth of the total width of the 

 plate, the sixth tergite strongly angulate at the middle. Length 0.7 

 mm. ; width 0.36 mm. Mississippi ( Vicksburg) minntlssima n. sp. 



Body somewhat stouter, shining, dark castaneous, the abdomen dark tes- 

 taceous, clouded gradually with blackish posteriorly ; legs and antennae 

 bright flavate; integuments distinctly micro -reticulate throughout; 

 head smaller, minutely, sparsely punctulate; prothorax fully twice as 

 wide as long, very much wider than the head, finely, sparsely punctu- 

 late, with a feebly defined impunctate median line; sides strongly 

 rounded, the base arcuate, feebly subtruncate toward the middle; 

 elytra only just visibly wider but evidently longer than the prothorax, 

 finely, asperulately and not very closely punctate; abdomen nearly as 

 wide as the elytra, subparallel, arcuately narrowed near the tip. Male 

 having two slender feeble arcuate carinae on the disk of the fifth ter- 

 gite, separated by about a fourth of the width of the plate and slightly 

 oblique toward each other posteriorly, the concave sides of the carinae 

 internal; sixth tergite largely concealed in the type, but apparently 

 obtusely lobed and rounded at the middle. Length 0.7 mm.; width 

 0.38 mm. North Carolina (Asheville) atoma n. sp. 



12 — Form very stout, parallel, convex, compact, polished, deep black, the 

 legs, base of the antennae, extreme tip of the abdomen and legs piceous, 

 the minute humeral umbones slightly pale; integuments reticulate with 

 the usual very fine incised lines enclosing somewhat coarse meshes ; 

 head moderate, transverse, with a few very fine punctures toward the 

 sides; eyes as usual; prothorax very short, distinctly more than twice 

 as wide as long and fully a third wider than the head, strongly rounded 

 at the sides, broadly arcuate at base, the surface with a few widely 



