306 
GKO. H. HORN, M. I). 
line extending to the middle of front; surface closely punctate, more densely in 
male. Thorax one-third wider than long, not narrowed at base, sides regularly 
arcuate, margin sinuous, hind angles with a strong arcuate carina in both sexes, 
disc convex, with a median shallow depression formed by two fovese, on each 
side of middle usually a smaller fovea, lateral depression moderately deep, but 
short; surface finely transversely strigose with fine punctures between; scutel- 
lum transversely carinate ; elytra slightly sinuate behind the humeri, slightly 
broadened behind the middle, apices subacutely rounded, serrulate, disc some- 
what flattened with a vague costa, the sutural margin elevated behind the 
middle, basal depressions moderately deep; surface rather densely imbricate- 
granulate; body beneath more shining than above; prosternal lobe subtruncate, 
intercoxal process moderately broad, acute at tip, proplenrse granulate, finely 
pubescent; metasternum at sides roughly transversely strigoSe. Abdomen finely 
])unctate, s]>arse along the middle, closer along the sides and dense at the side of 
the first segment; vertical portions of the segments finely pubescent, apical 
segment truncate; pygidium coarsely punctured and with a median carina pro- 
jecting strongly at apex ; claws dissimilar on the feet. Length .35 inch. ; 9 mm. 
Male . — Prosternum densely punctured between the coxse, more 
sparsely in front; surface not pubescent; first and second ventral 
segments each with a deep, smooth median groove, that on the second 
segment extending nearly to the suture posteriorly ; anterior tibite 
very distinctly mucronate, middle less distinctly, posterior tibiie sim- 
ple ; claws of middle and anterior tarsi cleft so close to the tip as to 
seem bifid, posterior claws broadly toothed at base. 
Female . — This sex has not, with certainty, been found among my 
specimens. It probably differs from the male in the manner usual 
in the group. 
In well preserved specimens of this species the underside of the 
body is more or less clothed along the side with a whitish efflores- 
cence, whereby the pubescence is made more evident, and apparently 
more dense. 
This species closely resembles pensus and auxins, so that it will be 
difficult to separate the females, especially from the latter, but the 
ventral characters of the male will enable it to be at once recognized. 
Hab . — Lake Superior region. New York, Massachusetts. 
A. Gory. — Form moderately robust, olivaceous bronze, suhopaque. 
Autemiae attaining the middle of the thorax, serrate from the fourth joint, 
slightly bronzed ; front rather flat, occiput slightly impressed, the line scarcely 
reaching the middle of the front; surface roughly punctured, somewhat stri- 
gose. Thorax wider than long, not narrowed at base, sides regularlj" arcuate, 
margin sinuous, hind angles with a strong arcuate carina in both sexes, disc 
convex, a vague median depression conij)osed of two parts, on each side often a 
small fovea, lateral depression moderate, surface indistinctly transversely stri- 
goso-punctate ; scutellum transversely carinate; elytra slightly sinuate behind 
the humeri, a little broader behind the middle, apices subacute, serrulate; disc 
