A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 185 



Figuee 77. — Anterior tibia of male (A), clypeus (B), and last visible abdominal 

 sternite of male (C) and of female (D) of Chrysobothris laricis. 



Male. — Moderately elongate, moderately convex above, rather strongly shin- 

 ing, piceous with -a distinct purplish tinge on the smooth, elevated spaces, 

 bronzy green in the punctured areas; beneath bronzy green, faintly purplish 

 along sides, and more strongly shining than above. 



Head bronzy green, with two small callosities on front, and a distinct, 

 smooth, longitudinal carina on occiput ; front flat ; surface coarsely, densely 

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

 hairs ; clypeus broadly, deeply, angularly emarginate in front, arcuately rounded 

 on each side. Antenna bronzy green, gradually narrowed to apex ; intermediate 

 segments subtriangular, slightly wider than long, broadly rounded at outer 

 margins; third segment nearly as long as following two segments united. 



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

 along middle; sides parallel and slightly sinuate at middle, arcuately con- 

 verging anteriorly and posteriorly ; anterior margin slightly sinuate, with a 

 vague, broadly rounded, median lobe ; base arcuately emarginate on each side, 

 median lobe rather strongly produced, narrowly truncate in front of scutellum ; 

 disk moderately convex, uneven, with a shallow, poorly defined, median sulcus, 

 limited on each side anteriorly by an obscure, irregular callosity ; surface 

 coarsely, densely punctate, more or less transversely rugose toward 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 slightly serrate; basal and humeral depressions broad and 

 deep ; surface glabrous, uneven, coarsely, densely punctate between costae and 

 elevated smooth spaces. Each elytron with four more or less distinct longi- 

 tudinal costae; first poorly defined anteriorly, distinct and strongly elevated 

 posteriorly, gradually diverging from sutural margin from middle to near 

 apex, where it is arcuate; second and third irregular, somewhat flattened, 

 more or less interrupted ; fourth sinuate, following outline of lateral margin ; 

 all costae joined to one another by irregular, transverse, smooth spaces. 



Abdomen beneath densely, coarsely, irregularly punctate, sparsely clothed at 

 sides with short, recumbent, white hairs, without distinct lateral callosities, 

 intervals densely granulose ; last visible sternite deeply, semicircularly emar- 

 ginate at apex, without a submarginal ridge, lateral margins slightly serrate; 

 eighth tergite rather densely, coarsely punctate, densely granulose, dorsal 



