248 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 104 



elytral margins, and on the head. Ventral surface strongly iridescent 

 bluish black with numerous long reddish setae. Antenna dark brown 

 with club light reddish brown. Legs black with traces of bluish 

 iridescence. Eye canthus, clypeus, and most of vertex coarsely, 

 densely punctured. The three tubercles on the head evident, the 

 posterior clypeal horn being quite pronounced. Posterior edge of 

 clypeus indicated by a distinctly indented line, which usually becomes 

 obsolete laterally. Clypeus margmed, generally evenly arcuate, but 

 in some cases extended and sharply arcuate anteriorly. Eye canthus 

 margined, forming a very obtuse angle with clypeus. Canthus 

 arcuate, usually slightly more so|posteriorly. Pronotum completely 

 margined, convex, more so laterally. Deeply, coarsely punctured 

 laterally, sometimes with punctures anteriorly and along vaguelj^ 

 indented midline. A very shallowly indented cluster of punctures 

 usuall}^ present laterally. Extremely fine secondary punctures some- 

 times closely scattered over pronotum. ScuteJlum large, sides mod- 

 erately arcuate. Convex elytra with striae well developed. Pro- 

 nounced, irregularly shaped elytral punctures usually separated by 

 about their own diameter, sometimes almost confluent. Elytral 

 margin very narrow, not widened anteriorly. 



The foretibia of the male differs in, two major respects from that 

 of the female. The anteriormost of the six or seven teeth of the 

 outer margin is expanded forward and slightly inward in the male 

 and is bifurcate. Also, there is on the mner flattened surface of the 

 foretibia of the male an uneven row of about three to five conical 

 teeth which are quite variable in size and number. In both sexes 

 there is a dorsal longitudinal raised carina extending along the 

 inner edge of the foretibia. This carina differs from those of hlack- 

 burnii, splendidus, semiopacus, and vlkei by bending slightly inward 

 opposite the penultimate tooth (pi. 2, fig. 12). A row of setae closely 

 approximates the carina throughout its length. On the external 

 face of the tibia of meso- and metathoracic legs there are three com- 

 plete transverse carinae and one or two partial ones. Posterior 

 edge of hind femur of male produced into a tubercle near coxa. Tarsal 

 claws similar in both sexes. 



Genital capsule and genitalia of male well developed and distinc- 

 tive (pi. 5, fig. 1). The left dorsal paramere is somewhat triangular 

 in outline, widest at base and sinuate near the tip. 



The size and shape of clypeus and density of the pimctures vary 

 greatly in this species. Color is fairly constant. Specimens north 

 of Maryland tended to be slightly smaller, more elongate, and yellow- 

 ish green, but none of these differences could definitely be correlated 

 with range. 



