A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 157 



Male. — Moderately elongate, slightly convex' above, subopaque, uniformly 

 piceous, with a faint cupreous reflection ; beneath brownish cupreous, with distinct 

 purplish and greenish tinges, bluish black on tarsi, more strongly shining than 

 above. 



Head uniformly bronzy green in front, becoming brownish cupreous on occiput, 

 with an indistinct longitudinal carina on occiput, and two small, obsolete 

 callosities on front ; front flat ; surface very finely, sparsely punctate with punc- 

 tures distinctly separate on front, coarsely, confluently punctate on occiput and 

 behind clypeus, sparsely clothed with long, erect, white hairs, intervals densely, 

 distinctly granulose ; clypeus broadly, shallowly, angularly emarginate in front, 

 slightly rounded on each side. Antenna bronzy green basally, brownish cupreous 

 and gradually narrowed to apex; intermediate segments not compact, subtriangu- 

 lar, distinctly wider than long, broadly rounded at outer margins; third segment 

 one-third shorter than following two segments united. 



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

 widest along middle; sides arcuately converging at base and apex, nearly 

 parallel along middle; anterior margin broadly, arcuately emarginate, without 

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

 lobe moderately produced, and subtruncate in front of scutellum ; disk moder- 

 ately convex, with a vague, longitudinal, median depression, a vague, transverse, 

 postapical depression, and a broad, inconspicuous depression on each side near 

 lateral margin ; surface coarsely, densely, deeply punctate, confluently punctate 

 at sides, and more or less rugose, sparsely clothed at sides with short, erect, 

 inconspicuous hairs, intervals densely granulose. 



Elytra slightly wider than pronotum, nearly twice as long as wide, widest 

 behind midd^; sides slightly diverging from humeral angles to behind middle, 

 then arcuately converging to tips, which are separately broadly rounded ; lateral 

 margins serrate ; basal depressions broad and deep ; humeral depressions broad 

 and shallow; surface glabrous, coarsely, densely punctate, transversely rugose 

 at sides, intervals densely granulose. Each elytron with the first costa strongly 

 elevated from apex to basal third ; second and third costae obsolete, broadly 

 interrupted ; fourth costa barely indicated, following outline of lateral margin. 



Abdomen beneath sparsely, coarsely, irregularly punctate, sparsely clothed 

 with short, erect, white hairs, without distinct lateral callosities, intervals 

 densely granulose; last visible sternite deeply, semicircularly emarginate at 

 apex, without a distinct submarginal ridge, lateral margins slightly serrate; 

 eighth tergite deeply, triangularly emarginate at apex, coarsely, snarsely 

 punctate, but not longitudinally carinate. Prosternum coarsely, confluently 

 punctate, densely clothed with long, erect, white hairs ; anterior margin broadly 

 rounded, with a distinct, narrow, median lobe. Anterior femur with a short, 

 obtusely angulated tooth, which is dentate on outer margin. Anterior and 

 middle tibiae arcuate, the former with a broad, elongate dilation at apex, and 

 deeply constricted behind dilation ; posterior tibia slightly sinuate. 



Length 10.5 mm., width 4 mm. 



Redescribed from the male lectotype, No. 3439, in the Academy of 

 Natural Sciences of Philadelphia. 



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

 brownish cupreous, sometimes slightly greenish behind the clypeus, more 

 sparsely, coarsely punctate, and sparsely pubescent, the antenna piceous, with 

 a faint cupreous or bronzy tinge, the last .visible sternite more narrowly emar- 

 ginate at apex, the eighth tergite slightly emarginate at apex, and coarsely, 

 confluently punctate, the prosternum sparsely punctured and sparsely pubescent, 

 the anterior tibia unarmed at apex, and the middle tibia only slightly arcuate. 



Type locality. — Western Nevada, no definite locality. 



DISTRIBUTION 



From material examined: 



California: Fallen Leaf Lake, July 14, 1925. Placerville, May to June, and 

 reared (H. E, Burke, F. B. Herbert, and J. J. Sullivan). Mesquite, June 

 3, 1916 (C. H Morton); reared (F. B. Herbert). Summerdale, July 3, 

 1906; Onion Valley, July 20, 1913 (H. E. Burke). Stanford University. 

 Yosemite Valley, June 22, 1916. Carrville, Trinity County, July 5 (E. C. 

 Van Dyke). 



