196 MISC. PUBLICATION 4 70, U. S. DEPT. OF AGRICULTURE 



Ftgube 82. — Anterior tibia of male (A), clypeus (B), and last visible abdom- 

 inal sternite of male (C) and of female (D) of Chrysobothris costifrons. 



Male. — Moderately elongate, slightly convex above, moderately shining, 

 piceous on smooth spaces, faintly cupreous in punctured areas ; beneath pur- 

 plish brown, with a faint bronzy tinge, and more strongly shining than above. 



Head uniformly bronzy brown, with a smooth, longitudinal carina on occiput ; 

 front flat; surface coarsely, irregularly, coniluently punctate on front, finely 

 punctate on occiput and clypeus, sparsely clothed with rather long, semierect, 

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

 rounded on each side. Antenna brownish cupreous, gradually narrowed to apex ; 

 intermediate segments compact, as long as wide, broadly truncate at outer mar- 

 gins ; third segment nearly as long as following three segments united. 



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

 near apex; sides obliquely converging at apices, slightly obliquely converging from 

 near apices to posterior angles ; anterior margin broadly, arcuately emarginate, 

 without a median lobe ; base broadly, arcuately emarginate on each side, median 

 lobe broadly rounded, and subtruncate in front of scutellum; disk moderately 

 convex, slightly uneven, with a smooth median line, a vague depression on each 

 side near lateral margin, a broad, irregular depression near base opposite middle 

 of each elytron, and with a few small, irregular, smooth callosities near apical 

 angles; surface sparsely, finely, irregularly punctate at middle, coarsely, con- 

 fluently punctate and more or less rugose at sides. 



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

 converging (more strongly posteriorly) from humeral angles to tips, which are 

 separately acutely angulated ; lateral margins coarsely serrate ; basal depressions 

 broad, moderately deep ; humeral depressions broad and shallow ; surface glab- 

 rous, slightly uneven, finely, densely, irregularly punctate between costae. Each 

 elytron with four smooth, elevated costae, first distinct, moderately elevated, 

 extending from apex to basal third ; second and third less distinct, broadly inter- 

 rupted, connected to each other by irregular, smooth, elevated spaces ; fourth 

 barely indicated on apical half, following outline of lateral margin ; and with 

 a densely punctured discal fovea interrupting second costa in front of middle, and 

 surrounded by an elevated, smooth border. 



Abdomen beneath coarsely, rather densely, irregularly fossulate-puncture at 

 middle, more or less rugose at sides, sparsely clothed at sides with short, recumbent, 

 white hairs, with indistinct, smooth, lateral callosities, intervals nearly smooth ; 

 basal sternite slightly, longitudinally concave and obsoletely punctate at middle ; 

 last visible sternite with a short, flat, smooth, median carina on basal half, and 

 a slightly elevated, serrate, submarginal ridge, semicircularly emarginate at 



