STUDIES IN THE AMERICAN BUPRESTID^ 6l 



dilated internally, their posterior edge being less oblique. The sexual 

 characters are much the same, the fifth ventral being more or less 

 similarly truncate and transversely impressed in both sexes, sometimes 

 with a minute tooth at each side of the truncature. The basal joint 

 of the hind tarsi is frequently much longer than the next two combined, 

 the epistoma broadly sinuato-truncate, the elytra invariably bispicu- 

 lose at tip and the coloration of the body always metallic. The 

 species are numerous, those known thus far being the following: — 



Pronotum finely and densely punctate between the smooth elevations even 

 medially; elytra with finer and denser punctures in a longitudinal 

 sublateral area; coloration generally greenish-metallic 2 



Pronotum sparsely and generally more coarsely punctate medially and 

 basally, the elytral sculpture more even, without a clearly demarcated 

 sublateral area of much finer and denser punctuation; size smaller as 

 a rule, the coloration generally coppery 11 



2 — Elytra rapidly narrowed from base to apex, the latter relatively acute. 

 Body rather stout, convex, shining, obscure greenish-metallic through- 

 out, the depressions rather closely but briefly pubescent; head with 

 large confused polished rugae, except broadly along the eyes and in 

 front, the depressions densely punctate, aenescent and densely pubescent; 

 prothorax about two-thirds wider than long, trapezoidal, the sides 

 strongly arcuate, converging and straighter anteriorly, sinuate toward 

 the prominent and acute basal angles, the base broadly sinuate laterally 

 and very broadly and feebly at the scutellum; apex broadly, feebly 

 arcuate medially; surface with numerous polished elevations, except 

 in the apical transverse impression, all the depressions densely punc- 

 tate; scutellum slightly transverse; elytra at the humeri much wider 

 than the prothorax, the sides feebly arcuate; surface of each with three 

 polished, somewhat ragged costae, the interval of the second and third 

 broad and unusually finely, densely punctate; striation only traceable 

 between the polished sutural elevation and the first costa; under sur- 

 face unequally punctate, finely and densely toward the bases of the 

 abdominal segments and on the hind coxae; prosternum narrowly and 

 feebly impressed and punctate along the middle; hind tarsi very slender 

 though evidently shorter than the tibiae. Length 21.5-23.5 mm.; 

 width 7.8-9.0 mm. California (Yuma). [ = Chalcophora planicosta 

 Lee] planicosta Lee. 



Elytra not rapidly narrowed from base to apex, at the humeri less notably 



broader than the prothorax as a rule 3 



3 — Eyes convex and notably prominent as in planicosta 4 



Eyes feebly convex, not at all prominent, continuing the general outline 

 curve of the head 10 



4 — Elevated polished spaces of the pronotum very numerous and conspic- 

 uous 5 



