336 [JUNE, 
slightly compressed, last joint oval, not acuminate. Thorax subcampanulate, 
sparsely punctured, shining, broadly impressed before the middle, obsoletely 
channelled, deeply foveate at the middle of the base. Elytra wider than usual, 
dilated inalieinl and convex, scabrous, with close set punctures. Beneath green- 
ish black ; middle tibiz slender, scarcely curved ; posterior tibiz with two small 
equal acute spurs. 
1s. L. conve xa, minus elongata, nigra, capite thoraceque parce punctatis, 
convexis, hoc ovali, subcanaliculato, basi medio foveato, elytris cyanescentibus 
postice dilatatis, scabro- -punctatis, antennis subserratis. Long. -41. 
Mexican Boundary Commission ; collected by Mr. Clark, under Col. J. D. 
Graham. Very similar to the preceding, but the head and thorax are black ; 
the latter is less companulate, more convex, and not impressed anteriorly; the 
elytra are more dilated posteriorly, and diverge at the suture. The feet and an- 
tenne precisely as in C. chalybea. 
C.sphericollis (Lytta sph. Say. Journ. Ac. Nat. Sc. 3, 299 ,) must be 
closely related to these two species, but will be distinguished by its more slender 
form, and by the second joint of the antenne being rufous. 
Be 
19. L. femoralis, enea, subnitida, supra fere glabra, thorace lateribus 
parce punctato versus basin angustato, basi subreflexo, elytris subtiliter pune- 
tulatis, pedibus cyaneis, femoribus (apice excepta) rufis, antennis nigris gracili- 
bus. Long. :7. 
One male specimen. Louisiana; Mr. Guex. Body siender, brassy somewhat 
dull. Head sparsely punctured, truncate at base, a little narrowed behind the 
eyes, which are large and prominent; labrum green, deeply emarginate, strongly 
punctured. Antenne, from the 5th to the 10th joints, gradually decreasing in 
length, increasing very slightly in thickness, slender, oblong, scarcely rounded ; 
eleventh joint subconstricted, external part conical. Thorax as wide as the 
head; slightly pentagonal, narrowed towards the base; disc slightly flattened, 
with several shallow impressions, sides sparsely punctured, scarcely pilose ; base 
slightly reflexed. Elytra a little wider than the thorax, finely and indistinctly 
punctulate, with a scattered, scarcely perceptible pubescence. Legs blackish 
blue, femora bright rufous, black at the apex ; the middle of the posterior tibiz 
is slightly rufous inferiorly; middle tibie short, slightly curved ; outer spur of 
the posterior tibie broad and concave. 
This species is very similar to the next, but the black tarsi, and finely punc- 
tulate elytra will distinguish it; the head is less quadrate and is not wider than 
the thorax: the anterior tibiz are emarginate at the apex internally, which is 
probably a sexual character. 
20. L. polita, enea, subnitida, supra fere glabra, thorace capite angustiore, 
lateribus parce punctatis versus basin angustato, bifoveato, basi subreflexo, ely- 
tris subtilissime rugosis pedibus rufis, genubus tibiisque anterioribus nigris, 
tarsis fuscis, antennis nigris gracilibus. Long. -65. 
Say, Journ. Ac. Nat. Sc. 3, 302. 
One female; Georgia. Body slender, brassy, somewhat dull. Head sparsely 
punctured, a little dilated behind the eyes, which are prominent, squarely trun- 
cate at base; labrum blue, punctured, deeply emarginate. Antenne black, a 
little longer than the head and thorax, scarcely thickened externaily, joints ob- 
long, equal in length, last joint longer, constricted, conical at tip. Thorax nar- 
rower tnan the head, longer than wide, slightly narrowed towards the base; 
sparsely punctured and slightly pilose towards the sides, disc somewhat flattened, 
deeply bifoveate, basal margin reflexed at the middle. Elytra scarcely wider 
than the head, parallel, very finely rugous, and obsoletely punctulate. Thighs 
rufous, coxe, trochanters and knees black, anterior and middle tibie black, 
slightly rufous in the middle; posterior tibiz rufous, black at tip: tarsi dark 
fuscous; outer spur of the posterior feet broad, concave and obtuse. 
21. L. Sayi, olivacea fere opaca, capite thoraceque parce pilosis, subtiliter 
