STUDIES IN THE AMERICAN BUPRESTID^ 1 63 



the sexual characters are those of lugubris and some others having 

 a broad uninterrupted sulcus. 



It may be noted here that the only synonymy preserved in this 

 paper is that referring to published species; the mere catalogue names 

 of Melsheimer and Dejean are not given, on the ground that they ought 

 not to be perpetuated. 



Group VI — Type americana Hbst. 



A small group resembling the preceding in the general form and 

 rough sculpture of its members, and with the elytral apices similarly 

 very slightly prolonged, but here the tips are deeply sinuate and biden- 

 ticulate, as in obscura and pugionata. The sexual characters of its 

 two species differ as conspicuously as in the two sections of the tetie- 

 hrosa group, indicating that the modifications of the intermediate 

 tibiae of the male in the second of the primary subdivisions of the genus 

 is not so important as a group character as in the first. The two species 

 may be described as follows: — 



Body brassy-brown; head punctured, concave, with a transverse raised 

 glabrous cranial line and two occipital callous spots, dull cupreous or 

 brassy; prothorax rounded at the sides anteriorly, parallel posteriorly, 

 unequal, roughly punctured, polished and punctate in the middle, with 

 a vitta of three or four elevated polished black spots on each side be- 

 tween the middle and submargin, the vitta sometimes entire, and with 

 a deep triangular impression in front of the scutellum, also a very 

 shallow oblong impression behind the middle of the anterior margin, 

 colored like the head; scutellum small, transversely linear; elytra striato- 

 punctate, the punctures large and deeply impressed, the interstices 

 finely chagrined, having also small and sparse sublinear polished 

 black elevations; tips short, bidentate; under surface and legs dull 

 cupreous, rugosely punctured, the pectus grooved, hairy; male with the 

 middle tibiae armed internally with a large tooth, the abdominal tip 

 truncato-emarginate; fifth ventral of the female tridentate at tip, the 

 middle tooth rounded apically. Length 16.0 mm.; width 6.0 mm. 

 Pennsylvania and southward. [ = spreta Lap. -Gory, impressifrons 

 Mels. and asperata Lee. nee Lap.-Gory] americana Hbst. 



Body oblong-suboval, moderately convex, polished and sparsely pubescent, 

 obscure aeneous to viridi-a?neous, bronzed beneath; head coarsely, 

 very irregularly sculptured, impressed centrally before a transverse 

 interocular line of callous areas, also with two approximate longitudinal 

 occipital callous spots, the eyes only moderately convex ; prothorax nearly 

 twice as wide as long, the sides broadly rounded and moderately inflated, 

 becoming not very converging and then parallel basally; surface very 



