44 Trans. Acad. Sci. of St. Louis. 
2 — Body black or piceous- black in color throughout. ....eeseccscerceees 8 
Body black, the elytra bright rufous, with an oblong sutural spot of black. 12 
3 — Species of the Pacific COaSt...--secce sees sececccssercceccccvce eseee 4 
Species of the Atlantic regions. ..cce-cocccccervece sccccescccccssccceses & 
4— Form stout, the body large in size, with the head strongly inflated and 
rounded at the sides behind the eyes, black, the elytra rufo-piceous, 
the legs pale, the antennae fascous; head large and well developed 
though distinctly narrower than the elytra, rather coarsely, closely 
punctate, the eyes moderate in size but convex and prominent; neck 
but little more than half as wide as the head; prothorax distinctly nar- 
rower, slightly elongate, the sides somewhat converging and arcuate 
anteriorly, widest well before the middle, the punctures moderately 
coarse, deep and well separated; elytra but just visibly longer than 
wide, parallel, nearly one-half wider and a third longer than the pro- 
thorax, not very coarsely but deeply, rather closely and confusedly 
punctate; abdomen slightly narrower than the elytra, more finely but 
very strongly and rather closely punctate. Male with the fifth ventral 
broadly, feebly sinuato-truncate, the sixth with an abrupt deep emar- 
gination, one-half deeper than wide, with the bottom narrowly rounded, 
its edges with anirregular polished bevel as usual, the surface not 
impressed; female with the head notably narrower and slightly less in- 
flated posteriorly, the sixth ventral broadly rounded at tip. Length 10.0 
mm.; width 1.75 mm. California (San Joaquin Co.).....tumidum Lec. 
Form more slender, the size smaller, the head never notably inflated behind 
the eyes, the sides straight, gradually rounding basally to the neck, the 
latter relatively broader, three-fifths as wide as the head............ 5 
5— Elytra evidently longer and very much wider than the prothorax, black, 
the elytra sometimes feebly picescent; head rather small, always much 
narrower than the elytra, moderately coarsely, deeply and rather closely 
punctured, the eyes moderately prominent; prothorax distinctly, 
though not very greatly, narrower than the head, much longer than 
wide, parallel, the sides feebly arcuate and somewhat converging 
anteriorly, the punctures moderately coarse and deep, confusedly 
aggregated along the median smooth space and toward the sides as 
usual; elytra in the male slightly, and in the female more distinctly, 
longer than the prothorax, fully two-fifths wider, slightly longer than 
wide, moderately coarsely, deeply, confusedly and very closely punc- 
tured throughout; abdomen shining, finely but strongly, rather closely 
punctate, slightly narrower than the elytra in both sexes. Male with 
the apex of the fifth ventral very distinctly but broadly sinuate in the 
middle, the sixth with a very deep, narrowly triangular notch, twice as 
deep as wide, with the angle rounded; female differing but little from 
the male in habitus or size of the head, the sixth ventral evenly and 
circularly rounded at tip. Length 8.0-9.3 mm.; width 1.4-1.55 mm. 
California (coast regions north of San Francisco).....pacificum n. sp. 
Var A— Almost similar to pacificum but rather smaller, somewhat more 
depressed and parallel and with the head relatively a little larger, 
almost as wide as the elytra, the punctures rather coarse, deep and 
perforate, well separated; prothorax large, much longer than wide, 
with the punctures still sparser, the sides subparallel, broadly 
