1863.] 
157 
tinctly punctured, the punctures becoming more dense and coarse each 
side at base. Corium broad, very bluntly oblique at tip, closely punc¬ 
tured, except upon the interior margin, the three impressed striae become 
confluent before the tip. Beneath smooth, shining, very flnely punc¬ 
tured, except upon the disk, where the punctures become very few. 
Coxae and legs rufo-piceous; tarsi testaceous. The usual carbon-black 
area is present each side of the pectus. 
Length 5 millim. Humeral breadth 3 millim. 
Hah. San Francisco. 
The unique specimen in my collection was kindly given me by Dr. 
John L. LeConte. 
5. C. denudata, n. sp. 
Similar to G. unicolor., Beauv. in form, but more narrowed posteri¬ 
orly, brassy black, very glossy. Head short, broad, slightly sinuated 
before the eyes, the tip subtruncated, the tylus slightly, and the mar¬ 
gins very narrowly recurved, the surface finely, obsoletely punctured; 
antennae pitchy-black, paler at the points of articulation; rostrum 
piceous, reaching the middle coxae. Thorax very convex, hardly ele¬ 
vated above the scutellum at base, impunctured, except at the sides, 
where it is longitudinally, shallowly impressed ] humeral angles slightly 
prominent, the impression anterior to them shallow, transverse. Scu¬ 
tellum not suddenly arched upon the disk, obliquely declining behind, 
the lateral margins slightly waved ) moderately sinuated at base, the 
basal middle impunctured, the sides closely punctured, but posteriorly 
less so, and near the base with a few very large punctures, .the extreme 
tip triangularly produced, impressed, scabrous. Corium acute at tip, 
punctured, with three approximate submarginal striae. Beneath finely 
punctured, the antepectus and disk of the venter posteriorly almost 
impunctate. Tarsi piceo-rufous. 
Length 4f millim. Humeral breadth 3 millim. % . 
Hah. Louisiana. 
6 . C. cyanea, n. sp. 
Bright steel-blue, polished, form of C. cilia,ta. Head broad, finely, 
densely, conflnently punctured, each side between the eye and ocellus 
with a short distinct sulcus ) antennae and rostrum piceous, the latter 
scarcely reaching the intermediate coxae. Thorax much broader than 
long, moderately convex, finely punctured upon the disc, very coarsely 
