A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 127 



side. Antenna piceous, gradually narrowed to apex ; intermediate segments 

 moderately compact, wider than long, broadly rounded at outer margins; third 

 segment as long as following two segments united 



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

 apex ; sides slightly converging at apical angles, strongly converging from near 

 apical angles to near posterior angles, where they are slightly constricted; 

 anterior margin slightly sinuate, with a broadly rounded median lobe ; base 

 strongly, arcuately emarginate on each side, median lobe moderately produced 

 and broadly rounded ; disk rather strongly convex, without distinct depressions or 

 callosities ; surface coarsely, rather densely punctate, more or less rugose toward 

 sides and along base, clothed at sides with a few inconspicuous hairs, intervals 

 densely granulose. 



Elytra distinctly wider than pronotum, twice as long as wide; sides parallel 

 from humeral angles to apical third, then arcuately converging to tips, which are 

 separately broadly rounded ; lateral margins finely serrate posteriorly ; basal 

 depressions broad and deep ; humeral depressions broad and shallow ; disk 

 moderately convex ; surface glabrous, coarsely, densely, uniformly punctate, with- 

 out distinct costae, intervals nearly smooth, and each elytron with a rather 

 distinct fovea in front of middle and a very indistinct one behind middle near 

 lateral margin. 



Abdomen beneath coarsely, sparsely punctate, smooth along anterior and 

 posterior margins of sternites, sparsely clothed with long, recumbent, white hairs, 

 without lateral callosities, intervals finely granulose ; last visible sternite broadly, 

 deeply, arcuately emarginate at apex, without a distinct submarginal ridge, lateral 

 margins finely serrate ; eighth tergite deeply, triangularly emarginate at apex, 

 densely granulose, coarsely, densely punctate, but not longitudinally carinate. 

 Prosterum coarsely, confluently punctate, sparsely clothed with long, recumbent, 

 whitish hairs ; anterior margin with a large, broad, median lobe. Anterior femur 

 with an indistinct tooth. Anterior tibia slightly arcuate, with a rounded dilation 

 at apical fourth ; middle and posterior tibiae straight. 



Length 5.5 mm., width 2.2 mm. 



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

 reddish cupreous, the last visible sternite deeply, narrowly emarginate at apex, 

 the eighth tergite broadly rounded at apex, confluently punctured, and longi- 

 tudinally carinate, the prosternum indistinctly pubescent, and the anterior tibia 

 unarmed at apex. 



Redeseribed from the male holotype and female allotype in the col- 

 lection of J. N. Knurl. 



Type locality. — Wickenburg, Ariz. 



DISTEIBUTION 



.From material examined: 



Arizona: Wickenburg, June 18, 1937, type series (D. J. and J. N. Knull). 

 Oracle, July 5-11 (Hubbard and Schwarz). Ashfork, June IS (Barber and 

 Schwarz). 



Also recorded from: 



Arizona : Prescott National Forest, July 29, 1937 (D. J. and J. N. Knull). 



Host. — Unknown, 



There is a slight variation in the small number of specimens ex- 

 amined. The color on the anterior half of the pronotum varies 

 from reddish cupreous to golden green. The clypeus is either angu- 

 larly or arcuately emarginate in front, and the foveae on the elytra 

 are usually more bronzy green than the rest of the surface. Some- 

 times the sides of the pronotum are more strongly converging pos- 

 teriorly than in other examples, in which case the pronotum is not 

 constricted near the base. The length is from 4.5 to 6 mm. 



