88 Trans. Acad. Sci. of St. Louis. 
distinctly shorter; abdomen not quite as wide as the elytra. Male with 
the third and fourth ventrals narrowly and very feebly impressed along 
the middle, the fifth more broadly and deeply so, the impression atten- 
nuate anteriorly and not attaining the base, the apex with a shallow, 
circularly rounded sinus in median third; sixth ventral narrowly and 
deeply impressed along the median line except near the base, the apical 
margin with a large and very deep angulate notch, the bottom of which 
is filled with a broad whitish submembranous area having a transverse 
or feebly sinuate posterior outline; impressions more coarsely pubes- 
cent or spiculose. Length 8.8 mm.; width 1.15 mm. Rhode Island 
CBoston, Neck)... obs hvcdr dines s spelen ab adebaeewsbeees rigidum n. sp. 
19 — Male with ventrals three to six impressed, the sixth with a narrow and 
deep emargination. Body parallel, shining, black or slightly piceous, the 
elytra gradually rufescent posteriorly; legs and antennae as in the pre- 
ceding species; head parallel and broadly arcuate at the sides, the 
latter merging gradually into the broadly rounded basal angles, the 
punctures fine but deep and very sparse; strongly obconic medial 
joints of the antennae but little more than one-half longer than wide; 
prothorax broad, but slightly elongate, a little wider than the head, 
subparallel, the sides becoming straight in the middle; punctures very 
sparse and only moderately coarse; elytra fully as long as wide, paral- 
lel and feebly arcuate at the sides, slightly wider and shorter than the 
prothorax, the punctures like those of the head, fine and very sparse; 
abdomen nearly as wide as the elytra. Male with the impression of the 
_ third and fourth ventrals narrow and feeble, of the fifth wider, deeper 
and elongate-oval, the apex feebly, broadly sinuate in the middle, the 
sixth with a large deep triangular emargination about as deep as wide, 
with its edges glabrous anteriorly, the impressions spiculose as usual; 
female with the sixth ventral rather small, feebly lobed at tip. Length 
8.5mm.; width 1.2mm. Rhode Island (Boston Neck). 
postremum 2. sp. 
Male with ventrals three and four wholly unmodified; five and six im- 
pressed, the sixth with a very broad sinus much wider than deep. Body 
parallel, stouter in form than postremum, polished, black, the elytra 
gradually rufo-piceous posteriorly as a rule; head subquadrate, the 
sides parallel and feebly arcuate, the angles rather broadly rounded, 
the punctures fine and very sparse; antennae stout, the strongly 
obconical joints one-half longer than wide; prothorax large, oblong, 
distinctly wider than the head, but little longer than wide, very feebly 
narrowed posteriorly from the rounded apical angles, the punctures 
coarse and very sparse; elytra subquadrate, parallel, slightly shorter 
and wider than the prothorax, normally convex, rather finely, very 
sparsely and confusedly punctate; abdomen as wide as the elytra, 
minutely and densely punctulate. Male with the fifth ventral narrowly 
and deeply impressed along the middle except near the base, the apex 
broadly, feebly sinuate toward the middle; sixth with a broader, deep, 
more anteriorly narrowed impression throughout, the apex with a 
broad and rather shallow sinus, three or four times as wide as deep, its 
bottom broadly, very obtusely angulate, the sinus fully half as wide 
as the segment; female with the sixth ventral obtusely lobed at tip, 
