Memoirs on the coleoptera

164
MEMOIRS ON THE COLEOPTERA
high marginal bead; elytra nearly three-fourths longer than wide,
widest only slightly behind the middle, oval, the sides strongly
rounded, becoming nearly straight basally, the general form remind-
ful of the preceding section of the group; ends of the basal margin
feebly dentiform, the carinule wholly wanting; surface rather
shining in both sexes, very closely, deeply creased and rugulose,
finely but strongly, sparsely punctate throughout, more coarsely and
irregularly toward the suture, the inner vestigial costule feeble;
abdomen shining, the legs very slender. Length (c?) 18.5 mm.;
width 9.0 mm. New Mexico (Magdalena Mts.), F. H. Snow.
congruens n. sp.
A Similar in general form to congruens but much more shining and
more feebly sculptured, the sides of the elytra becoming almost
straight basally, black, the elytra piceous-brown; head rather
sharply impressed transversely, coarsely, rather closely punctate,
finely and sparsely so on the vertex; antennae much longer than
the prothorax, rufo-piceous distally; prothorax as in congruens,
except that the coarsely and sparsely punctured sides are much less
narrowly and more deeply concavo-explanate and the surface
more alutaceous in the male, the marginal bead very thin and
high; elytra similar in form, more than one-half wider than the
prothorax but very smooth and evenly convex throughout the
width, highly polished, with the vestigial costules evident, the punctures
very fine and sparse, more evident and unequal suturally,
the creases very fine and sparse, the humeral carinule very short
and rapidly obsolete though quite evident, the sides of the base
scarcely at all prominent; abdomen alutaceous, finely creased,
distinctly and rather closely punctured apically; legs very slender.
Length (cf) 18.5 mm.; width 8.6 mm. Arizona (locality unrecorded)
lubricus n. subsp.
1 1 Body rather large and narrow, gradually dilated posteriorly, deep
black throughout; head rather shining, feebly impressed transversely,
more strongly at the sutures, strongly, not closely and rather un-
evenly punctate; antennae longer than the prothorax even in the
female; prothorax relatively well developed, nearly one-half wider
than long, two-thirds as wide as the elytra, subparallel, evenly and
somewhat strongly rounded at the sides, the apical angles but slightly
blunt, the basal moderately obtuse, very distinct, the basal sinuses
broad and extremely feeble; surface subopaque, moderately convex,
minutely, sparsely punctulate, rather abruptly and distinctly
concavo-explanate and sparsely and strongly punctate laterally,
the edge strongly elevated and thin; elytra about three-fifths longer
than wide, widest but little behind the middle, the sides strongly
arcuate, becoming strongly convergent and broadly sinuate basally,
the apical lobe small, moderately distinct, the humeral carinule
wanting, the ends of the basal margin feebly dentiform and prominent;
surface strongly shining, broadly flattened or slightly impressed
medially, the sutural region narrowly and feebly tumescent, the
vestigial costules obsolete, the creases feeble and the punctures