436 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 92 
buckhorni, with its central portion smooth and impunctate; median 
carina extending from epistomal margin to center of concavity, but 
rather indistinct and not sharply elevated; hairs at sides and above 
concavity, short, fine, inconspicuous. Eye more than three times as 
long as wide, more than half divided by a U-shaped emargination. 
Antenna with club less than twice as long as wide, all sutures oblique, 
the third more strongly than others. 
Pronotum about 1.16 times as wide as long, widest posteriorly; 
sides weakly arcuate and feebly convergent, on posterior half, then 
more strongly arcuate and convergent, constricted just behind the 
very broadly rounded front margin; surface shining, transversely 
impressed behind front margin; disk moderately finely, very deeply, 
rather closely punctate, not granulate, punctures finer and closer in 
front, sides with punctures smaller and closer than on disk, subgran- 
ulate, indefinitely impressed at each side of median line behind; 
lateral calli lacking; vestiture moderately short and fine, but visible. 
Elytra slightly wider than pronotum, about 1.36 times as long as 
wide; sides nearly straight and subparallel on anterior two-thirds, 
broadly rounded behind; surface brightly shining, reddish brown; 
striae impressed, about one-half (or less) as wide as interspaces, 
punctures moderately small, close, not deep ; punctures larger, shallow, 
and striae somewhat wider at sides; interspaces convex, rugose-granu- 
late, with a few small punctures bearing short, fine hairs, granules 
mostly confused, but approaching uniseriate arrangement on posterior 
half of disk. Declivity with second interspace narrower, nearly flat, 
smooth and impunctate, first and third strongly convex; first inter- 
space with moderately small serrations, some of those toward apex 
lacking, finely punctured, with moderately numerous, very fine, short 
hairs mesad to serrations; third interspace with moderately small ser- 
rations, slightly larger toward apex, with a few punctures bearing 
fine, short hairs; fifth, seventh, and ninth interspaces each with a few 
small serrations. Anterior face of mesosternum rather steep. 
Female.—Similar to male in general habitus but slightly more 
slender, about 2.11 times as long as wide; frons wider and shorter 
than in male, frontal rectangle about 0.63 as long as wide, closely, 
rather roughly granulate-punctate, with a rather fine but distinct 
median carina on lower half; elytral declivity with first and third 
interspaces strongly convex, moderately finely serrate throughout, 
smaller than in male, punctures more numerous, hairs much more 
numerous and many of those on first interspace short and stout, 
appearing scalelike. 
Type locality—Metaline Falls, Wash. 
Additional localities ——Wind River, Wash. 
Host.—T huja plicata D. Don. 
