34 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 62. 
lete on the disk. Scutellum sparsely, finely punctate and finely, 
densely granulated, glabrous, with the anterior angles nearly rec- 
tangular. Elytra as wide as pronotum at base, widest at basal fourth; 
humeral angles broadly rounded; sides broadly rounded to middle, 
then arcuately attenuate to the tips, which are conjointly broadly 
rounded, the lateral margin rather strongly serrate, and when viewed 
from the side is broadly arcuate, with a feeble sinuation for the pos- 
terior femora; each elytron with a broad, obsolete depression at the 
base, and a deeper one between the humerus and lateral margin, 
extending along the margin from the humeral angle to a round, deep 
depression behind the humerus, and then extending posteriorly along 
the margin, causing the elytron to have an obsolete lateral carina; 
surface coarsely and rather densely punctate, the punctures arranged 
in rows on the disk, the intervals finely, densely punctate and finely 
reticulate, sparsely clothed with very short, inconspicuous hairs. 
Abdomen beneath feebly convex, sparsely and rather finely punctate, 
with a few very short, inconspicuous hairs; intervals finely and 
densely reticulate; last segment rather acutely angulated at apex, 
with the margin flattened, the portion in front of the marginal groove 
a little more broadly angulated than the outer portion. Elytral 
epipleura narrow. Metasternum more coarsely punctured than the 
abdomen, and broadly, arcuately emarginate in front. Prosternum 
very feebly arcuately emarginate anteriorly; prosternal process about 
four times as wide as the coxal cavities, sides nearly parallel, and very 
broadly rounded at apex; episternum short, flat, and triangular. 
Prothoracic epipleura wide and nearly flat, with a deep, narrow 
groove behind the antennal groove, and a more shallow depression 
between it and the lateral margin, which is rather acute; antennal 
groove deep and wide, following the suture between the episternum 
and epipleura, extending into the latter to a little beyond the middle, 
and nearly parallel to the lateral margin. 
Female.—Differs from the male in being of a darker blue color, 
and having the last abdominal segment narrowed and feebly pro- 
duced at the apex, with eight teeth arranged in a semicircle, the 
central pair distinctly more widely separated than the others, and 
the two inner pairs a little shorter than the outer ones, the portion 
in front of the marginal groove with a large round lobe at apex, and 
the surface broadly transversely concave. 
Length, 3.4 mm.; width, 2.4 mm. 
Type locality—Type (male) Trinidad River, Panama; allotype 
(female) Ancon, Canal Zone, Panama. 
Type and allotype.—Cat. No. 25106, U.S.N.M. 
Described from two specimens, male and female. The type was 
collected by August Busck May 7, 1911, and the ane by A. H. 
Jennings. 
