NORTH AMERICAN COLEOPTERA. 
5 
punctate ; thorax distinctly longer than wide, sides scarcely arcuate, hind angles 
very slightly divergent, distinctly carinate, carina short, disc moderately convex, 
median line vaguely impressed posteriorly; surface sparsely punctate, a little 
more closely in front and near the front angles; elytra a little wider than the 
prothorax at their middle, humeri obtusely rounded ; disc moderately convex, 
rather deeply striate, strim punctate, intervals slightly convex, sparsely punc- 
tate ; prosternum moderately coarsely, but sparsely punctate, the lobe moderately 
prominent, arcuate in front, limited behind by a feeble transverse line, propleura; 
moderately closely coarsely punctate, with finer punctures between, not opaque; 
metasternum moderately closely punctate, punctuation coarse and fine inter- 
mixed ; abdomen similarly punctate, the last segment more coarsely; legs rufo- 
testaceous ; entire body beneath paler than above. Length 9 mm. ; .36 inch. 
A much more robust species than any of this group and with the 
thorax of larger area relative to the elytra. 
A specimen in the LeConte cabinet, which I have no doubt is the 
male, has a rather more slender form, the sides of thorax sinuate in 
front of the hind angles, which are consequently more slender and 
divergent. Its color is slightly darker. These differences, in view 
of the opposite sex of the specimens, seem purely sexual and not 
specific. 
Occurs in Canada and Oregon, S . 
C. hyperboreus Gyll. — Moderately elongate, depressed, piceous brown, 
moderately shining, antennsE and legs ferruginous; surface very sparsely pubes- 
cent ; antennse short, joints 4-10 as wide as long ; head slightly convex at middle, 
sparsely punctate; thorax as broad as long 9 > or a little longer % ; scarcely 
narrowed in front, sides regularly arcuate in front of the hind angles which are 
slender, divergent, and with a short carina; surface shining, sparsely punctate, 
median line vaguely impressed ; elytra wider than the thorax, oblong oval, 
widest at middle, humeri rounded, disc rather depressed, finely striate, strife 
indistinctly punctate at middle, intervals flat, sparsely punctate; prosternum 
sparsely punctate at middle, densely and finely at the sides, the lobe moderately 
prominent, arcuate in front, limited behind by a transverse impression, propleurse 
densely finely punctate, with coarser punctures intermixed, rather opaque, dis- 
tinctly pubescent; metasteruum sparsely punctate; abdomen closely punctate 
with coarse and fine punctures intermixed, and with fine brownish pubescence. 
Length 6.5 — 8 mm. ; .26 — .32 inch. 
This species is very nearly as depressed as those of the squalidus 
group. It is paler in color than Sanborni, and without the faint 
metallic lustre of that species and differing also in the color of the 
antennae. 
This species is known from Lapland, Siberia, Kamtschatka, and 
on our own continent in Alaska. 
C’. $$anborui Horn. — Oblong, moderately convex, piceous black, moder- 
ately shining, sometimes with a faint bronze surface lustre, very slightly pubes- 
cent; autennfe slender, feebly serrate, joints all longer than wide, iiasal joints 
