208 MISC. PUBLICATION 1 4 7 0, U. S. DEPT. OF AGRICULTURE 



Female. — Moderately elongate, rather strongly depressed above, subopaque,. 

 purplish, with greenish reflections on pronotiun, and elytra ornamented with 

 golden-green foveae ; beneath bright green, with more or less purplish reflections,. 

 especially at sides, and more strongly shining than above. 



Head bright green, with distinct, irregular, purplish spaces, a small, irregular, 

 smooth spot on front, and a smooth, longitudinal carina on occiput ; front slightly 

 convex, broadly, transversely depressed behind clypeus, uneven ; surface coarsely, 

 deeply, irregularly punctate on median part, more finely, densely punctate at sides,, 

 sparsely clothed, especially at sides, with moderately long, recumbent, inconspicu- 

 ous hairs ; clypeus broadly, shallowly, arcuately emarginate iu front, slightly 

 rounded on each side. Antenna purplish black, with a vague greenish reflection, 

 gradually narrowed to apex; intermediate segments compact, subquadrate, as 

 long as wide, broadly truncate at outer margins ; third segment as long as follow- 

 ing three segments united. 



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

 apical third ; sides arcuately converging near apical angles, obliquely converging 

 from apical third to posterior angles, which are rectangular; anterior margin 

 transversely subtruncate ; base arcuately emarginate on each side, median lobe 

 slightly produced, and broadly truncate in front of scutellum; disk moderately 

 convex, with a vague, longitudinal, median depression in front, and three broad,, 

 shallow depressions on each side; surface sparsely, finely punctate at middle, 

 coarsely, confluently punctate and more or less rugose at sides, sparsely clothed 

 at sides with very short, erect hairs. Scutellum long, acuminate posteriorly. 



Elytra at base slightly wider than pronotum at apical third, twice as long as 

 wide ; sides parallel from humeral angles to apical third, then arcuately converg- 

 ing to tips, which are separately narrowly rounded ; lateral margins coarsely ser- 

 rate ; basal depressions broad, deep, and golden green ; humeral depressions broad 

 and shallow; surface glabrous, moderately convex, deeply, densely, finely, uni- 

 formly punctate. Each elytron with four smooth, narrow, straight costae ; first 

 extending from base to apex ; second extending from base to near apex, strongly 

 elevated on apical half, barely indicated basally ; third short, interrupted poste- 

 riorly by postmedian fovea ; fourth strongly elevated on apical third, slightly ele- 

 vated basally, extending from apex to humeral angle, and following outline of 

 lateral margin ; and with three densely punctured, depressed, golden-green, discal 

 foveae, first in front of middle interrupting second costa, second at apical third 

 between second and fourth costae, and third near apex between first and second 

 costae. 



Abdomen beneath sparsely, irregularly fossulate-punctate, very sparsely clothed 

 with short, recumbent, white hairs, broadly, slightly flattened at middle, with 

 more or less distinct, smooth, lateral callosities, intervals smooth : last visible 

 sternite sinuately truncate at apex, with angles acutely produced, longitudinally 

 carinate at middle, with a coarsely serrate submarginal ridge, but the lateral 

 margins not serrate ; eighth tergite coarsely, densely punctate, broadly rounded 

 at apex. Prosternum transversely depressed along anterior margin, very sparsely, 

 finely, irregularly punctate, sparsely clothed at sides with short, semierect, wbite 

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

 short, acutely triangular tooth, which is indistinctly crenulate on outer margin.. 

 Anterior tibia slightly arcuate, unarmed; middle and posterior tibiae nearly 

 straight. 



Length 20 mm., width 8 mm. 



Redescribed from the female lectotype, No. 2704, in the Museum of 

 Comparative Zoology, Cambridge, Mass. 



Male. — Differing from the female in having the front of the head golden 

 green, more finely punctured and more densely pubescent, the antenna purplish 

 black except three basal segments, which are bronzy green, and the inter- 

 mediate segments slightly longer than wide, the last visible abdominal sternite 

 broadly, longitudinally concave at middle, deeply, arcuately emarginate at 

 apex, with the angle on each side broad and slightly emarginate, the eighth 

 abdominal tergite more sparsely punctured, and the anterior and middle tibiae- 

 strongly arcuate, slightly expanded at apices, and armed on their inner margins 

 with a number of small teeth. 



Type locality. — Sonora, Mexico. Lectotype simply labeled with a, 

 small disk. 



