A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 179 



Head bronzy green, more or less cupreous on elevated spaces, with a rather 

 broad, smooth, longitudinal carina on occiput, and two smooth, irregular cal- 

 losities on front ; front nearly flat ; surface coarsely, irregularly, confluently 

 punctate, sparsely clothed with long, erect, inconspicuous hairs ; clypeus broadly, 

 deeply, angularly emarginate in front, arcuately rounded on each side. An- 

 tenna bronzy green, gradually narrowed to apex; intermediate segments sub- 

 triangular, about as long as wide, subtruncate at outer margins ; third segment 

 nearly as long as following two segments united. 



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

 apex, widest near apex; sides abruptly converging at apex, slightly sinuate and 

 slightly converging from near apical angles to posterior angles ; anterior margin 

 deeply, arcuately emarginate, with an obsoletely rounded median lobe; base 

 transversely sinuate on each side, median lobe slightly produced and broadly 

 rounded; disk moderately convex, uneven, with a broad, longitudinal, median 

 depression, limited on each side by a smooth, irregular elevation, a rounded 

 depression on each side at apical fourth, and with numerous irregular callosities 

 or rugae on each side toward lateral margin ; surface coarsely, irregularly 

 punctate, with a few short, recumbent, inconspicuous hairs toward lateral 

 margins. 



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

 behind middle; sides feebly diverging from humeral angles to behind middle, 

 then arcuately converging to tips, which are separately narrowly rounded ; 

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

 surface glabrous, uneven. Each elytron with four more or less distinct longi- 

 tudinal costae ; first distinct, rather straight posteriorly, sinuate basally ; second 

 and third indistinct, interrupted; fourth barely indicated, sinuate, following 

 outline of lateral margin; intervals between costae with alternating densely 

 punctured areas and irregular, smooth, elevated spaces, the smooth spaces 

 connected to the costae. 



Abdomen beneath sparsely, finely, irregularly punctate at middle, more 

 densely, coarsely at sides, sparsely clothed with short, semierect, white hairs, 

 with smooth, vague, but not strongly elevated, lateral callosities, intervals indis- 

 tinctly granulose ; last visible sternite broadly, semicircularly emarginate at 

 apex, without a submarginal ridge, lateral margins slightly serrate ; eighth ter- 

 gite thickened at apex, sparsely, finely punctate, dorsal margin deeply, triangu- 

 larly emarginate at apex, projecting over ventral margin, which is broadly 

 rounded at apex. Prosternum densely, coarsely punctate, somewhat rugose, 

 rather densely clothed with long, semierect, white hairs ; anterior margin 

 arcuately rounded, without a median lobe. Anterior femur with an obtusely 

 angulated tooth, which is slightly dentate on outer margin. Anterior tibia 

 strongly arcuate, with a broad, sinuate dilation at apex, slightly constricted 

 behind dilation ; middle tibia rather strongly arcuate, gradually dilated toward 

 apex; posterior tibia straight. 



Length 12 mm., width 5 mm. 



Redescribed from a male in the United States National Museum 

 from Banff, Alberta, Canada, collected August 23, 1927, by Owen 

 Bryant. 



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

 cupreous, coarsely, sparsely punctate, and more sparsely pubescent, the antenna 

 more cupreous, with a faint bronzy-green tinge, the last visible sternite more 

 elongate, with a small, semicircular emargination at apex, the eighth tergite 

 not thickened, but slightly emarginate at apex, with the surface more coarsely 

 punctured, the prosternum more sparsely, coarsely punctate, and more sparsely 

 pubescent, the anterior tibia unarmed at apex, and the middle tibia not dilated 

 toward apex. 



Type locality. — Of trine'rvia, Canada "(latitude 54° and 65°) and 

 the Rocky Mountains"; type in the British Museum. Of cicatricosa, 

 Kodiak Island, Alaska ; type supposed to be in the Zoological Museum 

 at Moscow. 



Distribution. — Material has been examined from various localities 

 in Alberta, British Columbia, Manitoba, New Brunswick, and Nova 

 Scotia, Canada, in Alaska, and in the following States: California, 

 Colorado, Idaho, Maine, Michigan, Minnesota, New Hampshire, New 

 York, Oregon, Utah, Vermont, and Wyoming. 



