A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 77 



Head uniformly bronzy brown, with two irregular, smooth callosities on 

 front, and a narrow longitudinal carina on occiput, the carina bifurcate 

 anteriorly ; front slightly convex ; surface coarsely, densely, irregularly punc- 

 tate, sparsely clothed with long, fine, semierect hairs, intervals finely, densely 

 granulose ; clypeus semicircularly emarginate in front, arcuately rounded on 

 each side. Antenna uniformly brownish cupreous, nearly equal in width 

 to apex; intermediate segments slightly wider than long, subtruncate at outer 

 margins ; third segment subequal in length to following two segments united. 



Pronotum twice as wide as long, narrower at apex than at base, widest at 

 basal third ; sides diverging from apical angles to basal third, where they are 

 arcuately rounded, then arcuately converging to posterior angles ; anterior 

 margin slightly sinuate, without a distinct median lobe ; base broadly, arcuately 

 emarginate on each side, median lobe broadly rounded ; disk uniformly convex, 

 without depressions or callosities, but with an indistinct, longitudinal, im- 

 pressed, median line ; surface glabrous, coarsely, rather densely, uniformly punc- 

 tate at middle, more densely punctate and transversely rugose at sides. 



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

 at apical third; sides slightly diverging from humeral angles to apical third; 

 then obliquely converging to tips, which are conjointly broadly rounded; lateral 

 margins coarsely serrate posteriorly; basal depressions deep; humeral depres- 

 sions scarcely indicated; surface glabrous, rather densely, uniformly punctate, 

 more densely at sides. Each elytron with four longitudinal costae ; first straight, 

 strongly elevated from apex to basal third ; second sinuate, extending from 

 apex to base, strongly elevated posteriorly, interrupted by median fovea ; third 

 short, joined to fourth at basal fourth, interrupted posteriorly by second fovea ; 

 fourth scarcely indicated, following outline of lateral margin; with three 

 vaguely impressed, discal foveae, one at apical fourth between first and second 

 costae, second more anterior and interrupting third costa, and third slightly 

 in front of middle and interrupting second costa. 



Abdomen beneath coarsely, irregularly punctate at middle, densely punctate 

 at sides, sparsely clothed toward sides with long, recumbent, whitish hairs, 

 intervals densely, finely granulose ; sternites vaguely, longitudinally concave 

 at middle, with smooth, elevated, lateral callosities ; last visible sternite longi- 

 tudinally concave, shallowly emarginate at apex, with an elevated, serrate, sub- 

 marginal ridge, lateral margins strongly serrate; eighth tergite slightly 

 emarginate at apex, coarsely, sparsely punctate, densely granulose, but not 

 longitudinally carinate. Prosternum sparsely, finely punctate at sides, smooth 

 at middle, sparsely clothed with long, recumbent, whitish hairs, broadly rounded 

 in front, but without a distinct median lobe. Anterior femur with a large 

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

 strongly arcuate, unarmed at apex ; middle and posterior tibiae straight. 



Length 11.5 mm., width 5 mm. 



Kedescribed from the female lectotype (present designation), No. 

 42654, in the United States National Museum. 



Male. — Differing from the female in having the clypeus bright green, the front 

 of the head more finely, densely, uniformly punctate, and rather densely clothed 

 with long, recumbent, white hairs, the last visible abdominal sternite broadly, 

 shallowly, arcuately emarginate at apex, the eighth tergite more sparsely punc- 

 tured, and rather deeply, triangularly emarginate at apex, the prosternum more 

 densely pubescent, the middle tibia slightly arcuate and armed with a vague 

 triangular dilation near apex, and the anterior tibia strongly arcuate, with a 

 large triangular tooth near apex. 



Type locality. — El Taste, Lower California. 



DISTRIBUTION 



From material examined: 



Lower California: El Taste, type series (G. Beyer). Santa Rosa and San 

 Felipe (G. Beyer, Notman collection). 



Host. — Unknown. 



Very little variation was observed in the few specimens examined 

 except in size, and that in some of these specimens the median im- 

 pressed line on the pronotum is absent. No differences were observed 



