202 MISC. PUBLICATION 4 7 0, U. S. DEPT. OF AGRICULTURE 



Male. — Moderately elongate, rather strongly depressed above, moderately 

 shining, piceous, with distinct greenish and purplish reflections in different 

 lights; beneath dark bronzy green, with a distinct purplish tinge, and more 

 strongly shining than above. 



Head brownish cupreous, with a narrow, smooth, longitudinal carina on oc- 

 ciput, the carina arcuately bifurcate on vertex; front flat, broadly, transversely 

 depressed behind clypeus ; surface finely, deeply, confluently punctate, somewhat 

 granulose, rather densely clothed with long, erect, inconspicuous, white hairs ; 

 clypeus broadly, rather deeply, angularly emarginate in front, arcuately rounded 

 on each side. Antenna bronzy green on basal segments, testaceous on apical 

 segments, slightly narrowed to apex ; intermediate segments compact, quadrate, 

 broadly truncate at outer margins ; third segment as long as following three 

 segments united. 



Pronotum nearly twice as wide as long, wider at base than at apex, widest 

 at apical third ; sides arcuately converging anteriorly, obliquely converging from 

 apical third to posterior angles : anterior margin arcuately emarginate, with 

 a vague, arcuate, median lobe ; base broadly, arcuately emarginate on each side, 

 median lobe slightly produced, and truncate in front of scutellum ; disk mod- 

 erately convex, with a vague, broad, median, longitudinal depression, and three 

 broad, moderately deep depressions on each side, a transverse one near an- 

 terior margin, a round one near base, and an oblique one behind apical angle : 

 surface sparsely, finely punctate at middle, coarsely, confluently punctate at 

 sides, sparsely clothed toward sides with short, erect hairs. Scutellum long, 

 and acute posteriorly. 



Elytra distinctly wider than pronotum at apical third, twice as long as wide; 

 sides parallel from humeral angles to apical third, then arcuately converging 

 to tips, which are separately narrowly rounded, with a minute tooth at ape^: ; 

 lateral margins slightly serrate ; basal depressions broad and very deep ; 

 humeral depressions broad and moderately deep ; surface slightly convex, fineiy. 

 irregularly, confluently punctate, without conspicuous pubescence. Each elytron 

 with four more or less distinct, smooth, longitudinal costae ; first extending from 

 base to apex, strongly elevated on apical two-thirds, becoming obsolete near 

 base ; second extending from basal third to near apex ; third short, extending 

 from posterior fovea to near humerus ; fourth following outline of lateral 

 margin, distinct on apical third, becoming obsolete anteriorly; and with three 

 slightly bronzy foveae, the first transverse at apical third between second and 

 fourth costae, more or less interrupting the second costa, the second in front 

 of middle between first and third costae, and a very small spot a little more 

 anterior between first and second costae. 



Abdomen beneath finely, sparsely, irregularly fossulate-punctate. rather densely 

 clothed at sides with short, recumbent, white hairs, broadly, feebly flattened 

 at middle, with vaguely indicated lateral callosities, intervals vaguely granu- 

 lose ; last visible sternite deeply, subquadrangularly emarginate at apex, with 

 the angle on each side broad and slightly emarginate, broadly, longitudinally 

 concave at middle, the concavity limited on each side by a vague carina, witn 

 an obscure submarginal ridge, but lateral margins not serrate; eighth tergite 

 sparsely, coarsely punctate, rounded at r.pex. Prosternum smooth at middle, 

 finely, densely punctate at sides, sparsely clothed with long, erect, whitish 

 hairs ; anterior margin truncate, without a median lobe. Anterior femur with 

 a short, acutely triangular tooth, which is distinctly dentate on outer margin. 

 Anterior and middle tibiae arcuate, slightly dilated at apices and armed with 

 a series of very minute teeth on inner margins; posterior tibia straight. 



Length 19 mm., width 6 mm. 



Redescribed from the male lectotype. No. 3762. in the Museum of 

 Comparative Zoology, Cambridge. Mass. Specimen not labeled with 

 locality. 



Female. — Differing from the male in having the front of the head bronzv 

 brown, and more coarsely, irregularly punctate, the antenna uniformly bronzy 

 brown, the last visible sternite more elongate, truncate at apex, with the angles 

 obtusely produced, and with a strongly elevated median carina, and the anterior 

 and middle tibiae feebly arcuate, and unarmed on their inner margins. 



Type locality- — Tamaulipas to Matamoros, Mexico. 



