Memoirs on the coleoptera

346
MEMOIRS ON THE COLEOPTERA
Mr. Schaeffer as occurring at Palmerlee, Arizona (Bull. Bk. Inst.,
I, p. 162) and with the usual great color variability, which, in the
light of the above statements, is probably in large part
origin.
Stenosphenus Hald.
sexual in
An extensive genus in the warmer parts of North America and
having rather mixed affinities; the spinose antennae suggest some
of the next tribe, and other features recall Elaphidion, but, on the
whole, it is very
isolated and without close allies. The two fol-
lowing species have not yet been described :
Stenosphenus lucanus n. sp. Rather stout, less parallel than dolosus
Horn, shining, deep black, the prothorax above and beneath bright red,
the femora piceo-rufous, the anterior brighter than the others, the outer
face of all the tibiae with a fine strong entire carina, abbreviated apically
only on the anterior; head strongly, densely punctate, with the usual
fine raised median line; antennae (cf ) not quite one-half longer than the
body, very slender, of the usual structure, the spines small and slender;
prothorax widest rather behind the middle, not quite as long as wide,
the sides evenly rounded, more converging anteriorly, the apex threefourths
as wide as the base, the basal constriction moderate; punctures
rather small but perforate, sparse, very irregular in distribution; elytra
wider than the prothorax, rather strongly narrowed from base to apex,
not quite two and one-half times as long as wide, rather coarsely, strongly
punctate, the punctures closer medially and externally on each elytron,
sparse toward the suture, the apices obliquely truncate and strongly
bispinose. Length (cf) 10.0 mm.; width 2.5 mm. Lower California.
Not closely allied to any other and differs from rufipes Bates in
its less coarsely punctate pronotum,
shorter antennae and other
features. The prosternum of the male has a depressed and very
isolated, transversely oval and coarsely, densely punctate areola
midway between each coxa and the anterior margin.
Stenosphenus pruddeni n. sp. More elongate than lucanus, not
parallel, shining, pale rufous, the elytra and abdomen piceous; head
rufous, black basally, coarsely, closely punctate between the median
line and the eyes; antennae ( 9 ) at least a fifth shorter than the body,
joints three to seven spinose; prothorax as long as wide, the sides feebly
converging and broadly, feebly arcuate between the distinct basal and
apical constrictions, the punctures coarse and conspicuous, rather sparse
but very uneven in size and distribution, with a broad impunctate median
line; scutellum semicircular, densely pubescent; elytra much wider than
the prothorax, but little narrowed from the base, two and two-thirds
times as long as wide, transversely truncate and very minutely bidentate
at apex, the punctures strong, only moderately sparse, closer on the flanks,