224 Trans. Acad. Sci. of St. Louis. 



modified, the surlace with two small tumescent processes very near the 

 apex, separated by about twice their own width, the sixth segment with 

 a large simple rounded sinus, nearly three times as wide as deep. 

 Length 3.7 mm. ; width 0.7 mm. Massachusetts biarmatns Lee. 



Nearly similar throughout to the preceding but a little larger, the prothorax 

 relatively smaller and less elongate, two-thirds as wide as the head, with 

 the polished median line still narrower and distinctly concave; elytra 

 larger, quadrate, a third wider and obviously longer than the prothorax. 

 Male with the apex of the fifth ventral retilinearly truncate and unmodi- 

 fied, the surface with two tumescent processes as in biarmatus, but having 

 these processes very much smaller and separated by fully three times 

 their own width, the sixth segment with a large and nearly similar 

 sinus at tip. Length 3.9 mm.; width 0.75 mm. Lake Superior (Bay- 

 field") , — Mr . Wicliham — and Iowa lacustrinus n sp. 



Somewhat similar to the two preceding in general form, piceous, the pro- 

 thorax dusky rufous, the abdomen black; head more evenly and semi- 

 circularly rounded throughout from eye to eye, the confluent punctures 

 somewhat coarser than in biarmatus; prothorax narrower and relatively 

 more elongate, the angles very obtuse and rather more rounded, the 

 punctures dense and confluent, the median impunctate line much wider 

 and wholly unimpressed; elytra more convex and more finely and 

 sparsely punctate, a little shorter than wide, with pale apex, rather 

 shorter than the prothorax and two-fifths wider, less obviously narrower 

 than the head than in biarmatus; abdomen at base slightly narrower 

 than the elytra, at about the middle as wide as the latter, less densely 

 punctulate and more polished. Male having the apex of the fifth ventral 

 rectilinearly truncate, with a very small feeble arcuate lobe at the 

 middle, the surface with two transverse and very feeble, densely and 

 coarsely setulose tumidities very near and parallel to the hind mar- 

 gin, mutually separated by a very narrow space scarcely half as wide 

 as either, the sixth segment with a very large simple parabolic sinus 

 at tip. Length 3.7 mm.; width 0.7 mm. New York (near the citj). 



abbreYiellus n. sp, 



10— Median smooth line of the pronotum narrow, the polished elytra sub- 

 metallic in lustre. Rather stout, convex, dark piceous in color, the 

 abdomen black, the elytral apex narrowly pale, more broadly toward 

 the sides, the legs pale luteo-flavate throughout, the antennae dark 

 rufous; surface dull, somewhat coarsely, densely and confluently punc- 

 tate anteriorly, the elytra and abdomen sparsely, finely punctate and 

 polished; head relatively small, rather longer than wide, the eyes large, 

 convex and prominent, at about their own length from the base meas- 

 ured longitudinally, the contour behind them ogival; antennae mod- 

 erately long and slender, distinctly incrassate distally; prothorax 

 slightly elongate, fully three-fifths as wide as the head, the sides obtusely 

 but very distinctly angulate at two-fifths from the apex, thence very 

 feebly converging and straight to basal fifth, then strongly converging 

 and sinuate to the base; elytra large, quadrate, parallel, broadly con- 

 vex distinctly wider than the head, three-fourths wider and nearly 

 a third longer than the prothorax; abdomen at base distinctly narrower 

 than the elytra, the third and fourth segments generally subequal in 



