Memoirs on the coleoptera

322
MEMOIRS ON THE COLEOPTERA
4 Elytral corrugations sharply marked, strong; antennae varicolored.. .
5
Elytral corrugations obtusely wave-like and feebler; antennae black
throughout in both sexes 6
5 Body larger
black, the
and less
anterior
slender, parallel; under surface
tibiae rufescent except basally
and legs deep
and apically;
head and pronotum feebly rufescent, elytra fulvous-yellow, broadly
black at base; antennae (cf) two-thirds longer than the body, only
moderately slender, the basal joint rufescent, black apically, second
dark rufous, all the remainder rufous, becoming black at their
extreme apices, the eleventh feebly blackish just before the apical
prolongation, which is distinctly differentiated though rigidly attached,
its apex but feebly arcuate, not enlarged and only minutely
tipped with black; prothorax as in coquus throughout but with the
erect black hairs shorter and less dense; elytra as wide as the prothorax,
parallel, conjointly semicircular at apex, but slightly more
than twice as long as wide; prosternum with strong, irregular, closeset
punctures, much less coarse than in peninsula re; abdomen minutely,
very densely
mm.; width 5.8 mm.
punctate and subopaque. Length (cf)
Arizona (locality unrecorded).
20.0
densiventre n. sp.
Body smaller and more slender, the elytra more elongate, piceous-black,
the elytra bright fulvous-yellow, black only at the extreme basal
margin; antennae (cf) nearly similar in coloration but shorter and
much more slender, a third to nearly one-half longer than the body,
the first two joints black, the black apices of the remainder more
extensive than in the preceding; prothorax similar but relatively
smaller, the vestiture similarly rather short and only moderately
dense, the punctures rather less irregular in form and the three discal
callous elevations much less distinct; elytra fully as wide as the prothorax,
parallel, broadly rounded at apex, nearly three times as
long as wide; prosternum less coarsely and more loosely punctate
but opaque; abdomen more shining, the very minute punctures
well separated and smaller; legs shorter and more slender, the hind
tibiae almost similarly compressed and more so than in any form of
coquus; legs black or piceous-black throughout. Length (cf ) 14.0-
16.0 mm.; width 3.8-4.2 mm. Utah (southwestern), Weidt.
auripenne Csy.
6 Hind tibiae straight; arcuate tip of process of last antennal joint not
dilated. Deep velvety-black throughout, the elytra each with a
moderate elongate-oval submarginal spot well before the middle,
pale orange, the spot sometimes extending across, gradually narrowing
to the suture, at least in the female, where it is always more
extended than in the male. Male with the antennae three-fourths
longer than the body, slender, the last joint more than one-half as
thick as the third, with the apically arcuate appendage very strongly
differentiated, apparently forming an additional joint but rigidly
connected; prosternum strongly, deeply, irregularly and very densely
punctate, opaque; abdominal punctures fine but strong, very dense;
pronotal punctures strong, extremely dense and subconfluent.
Female rather smaller, with the antennae slender, as long as the body,