A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 67 



distinctly emarginate at the apex. The length is from 6.5 to 8 mm. 

 Horn (1886) says that the prosternum is not lobed in this species, 

 but in all the specimens, including the types of aeneola and purpurata, 

 the prosternum is distinctly lobed in front. Chamberlin (1926) gives 

 the type locality as Nebraska, which is incorrect, as LeConte de- 

 scribed the species from a male and female collected at Fort Riley, 

 Kans., by John Xantus. Nebraska is the type locality for purpurata 

 Bland. 



(20) Chrysobothris humilis Horn 



(Fig. 20) 



Chrysobothris humilis Horn, 1886, Amer. Ent. Soc. Trans. 13 : 99, 102-103, pi. 6, 

 figs. 169-172 ; Kerremans, 1892, Soc. Ent. de Belg. Mem. 1 : 214 ; Chamberlin, 

 1926, Cat. Buprestidae North Amer., p. 158; Obenberger, 1934, in Junk 

 (pub.), Coleopt. Cat, pt. 132, p. 636. 



^4 



Figure 20. — Clypeus (A) and last visible abdominal sternite of female (B) of 



Chrysobothris humilis. 



Female. — Narrowly elongate, subcylindrical, slightly depressed above, sub- 

 opaque, uniformly bluish green ; beneath bluish or purplish black, the legs more 

 or less cupreous. 



Head bluish green, with a vague longitudinal carina on occiput; front nearly 

 flat ; surface densely, coarsely, deeply punctate, more confluently toward clypeus, 

 sparsely clothed with moderately long, semierect, whitish hairs, intervals smooth ; 

 clypeus smooth, broadly, shallowly, arcuately emarginate in front, obtusely 

 rounded on each side. Antenna uniformly piceous, robust, short, extending to 

 middle of pronotum, slightly narrowed to apex; intermediate segments wider 

 than long, broadly rounded at outer margins; third segment slightly longer 

 than fourth. 



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

 at middle; sides strongly arcuately rounded; anterior margin feebly sinuate, 

 with a broad, slightly rounded, median lobe ; base broadly, arcuately emarginate 

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

 without depressions or callosities; surface coarsely, deeply, uniformly, con- 

 fluently punctate, with a few very short, inconspicuous, recumbent hairs. 



Elytra at base subequal in width to pronotum at middle, twice as long 

 as wide, not extending to tip of abdomen; sides nearly parallel anteriorly, 

 slightly, arcuately expanded behind middle, then arcuately converging to tips, 

 which are separately broadly rounded; lateral margins vaguely, coarsely ser- 

 .rate; basal depressions broad and deep; humeral depressions scarcely indi- 

 cated; surface slightly uneven, without foveae or costae, finely, deeply, uni- 

 formly, confluently punctate, with a few short, inconspicuous, recumbent hairs. 



Abdomen beneath strongly convex, rather densely, coarsely punctate, densely 



