A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 173 



Male.— Broadly elongate, slightly convex above, rather strongly shining, pice- 

 ous, with a faint purplish reflection on elevated, smooth spaces, bronzy green, 

 vaguely cupreous or greenish in certain lights in the depressed, punctured areas ; 

 beneath purplish cupreous, with a vague bronzy reflection in certain lights, more 

 or less greenish on prosternum, legs, and sutural margins of abdominal sternites, 

 and more strongly shining than above. 



Head bronzy green, with a narrow, smooth, longitudinal carina on occiput, and 

 two small, inconspicuous, smooth callosities on front ; front flat ; surface finely, 

 densely punctate, sparsely clothed with moderately long, erect, inconspicuous 

 hairs; clypeus broadly, rather deeply, arcuately emarginate in front, arcuately 

 rounded on each side. Antenna nearly equal in width to apex, bright green, the 

 last segment and apices of intermediate segments piceous; intermediate segments 

 subtriangular, not compact, as long as wide, broadly rounded at outer margins ; 

 third segment as long as following two segments united. 



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

 base; sides arcuately converging at apical angles, slightly sinuate and nearly 

 parallel from near apical angles to near posterior angles, which are rectangular ; 

 anterior margin arcuately emarginate, without a 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 on apical half by a broad, irregular, smooth callosity, and on each 

 side at apical third midway between this callosity and lateral margin a short, 

 sinuate callosity; surface densely, finely, irregularly punctate, more coarsely 

 punctate and with a few short hairs at sides. 



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

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

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

 margins strongly serrate; basal depressions broad and deep; humeral depres- 

 sions broad and shallow ; surface glabrous. Each elytron with the first costa 

 strongly elevated from apex to basal fourth, the other costae replaced by short, 

 smooth lines, and smooth, irregular, transverse spaces, alternating with finely, 

 densely punctured areas. 



Abdomen beneath rather densely, irregularly, shallowly fossulate-punctate, 

 sparsely clothed with short, recumbent, inconspicuous hairs, without distinct 

 lateral callosities, intervals indistinctly granulose ; last visible sternite broadly, 

 semicircularly emarginate at apex, with a short, vague, serrate, submarginal 

 ridge, lateral margins coarsely serrate ; eighth tergite thickened at apex, densely 

 granulose, coarsely, sparsely punctate, dorsal margin slightly emarginate at 

 apex. Prosternum densely, finely punctate, very densely clothed with long, 

 erect, white hairs at middle, more sparsely, coarsely punctate at sides ; anterior 

 margin truncate, without a median lobe. Anterior femur with a large, obtusely 

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

 strongly arcuate, with a rather broad dilation at apex; middle tibia strongly 

 arcuate, gradually expanded toward apex ; posterior tibia straight. 



Length 14.5 mm., width 6 mm. 



Kedescribed from the male type in the collection of C. A. Frost. 



Female. — Differing from the male in having the head purplish brown, with 

 the intervals nearly smooth, the callosities on the front more distinct, the antenna 

 bronzy brown, becoming more cupreous on basal segments, the prosternum more 

 finely punctate and sparsely pubescent, the last visible sternite more shallowly 

 emarginate at apex, the eighth tergite rounded at apex and confluently punctate, 

 and the tibiae unarmed at apices. 



Type locality. — Orono, Maine. 



DISTRIBUTION 



From material examined : 



Maine: Orono, July 4, 1908, male type (C. A. Frost) ; July 26, 1905, female 



allotype (J. N. Knull). 

 Michigan: Marquette, July 1 (Hubbard and Schwarz). 

 Virginia: Nelson County, June 25, 1928 (W. Robinson). 



Recorded by Knull ( 1930) from North Carolina and Fresno County, 

 Tenn. 



