238 PROCEEDINGS OF THE NATIONAL MUSEUM vol. i04 



Length 10 to 18 mm., greatest width 6.5 to 11 mm. 



Color of dorsum dark shining coppery black to black. Occasional 

 specimens dark brown. Ventral sm-face and legs black. Antenna, 

 except basal segment which is black, dark reddish brown to black, 

 club reddish brown. Eye canthus, clypeus, and anterior portion of 

 vertex coarsely, densely punctured. The three tubercles on the head, 

 one near the median basal margin of the clypeus and one beside each 

 eye, lack punctures. A distinctly indented narrow line runs from the 

 middle of the vertex forward to the clypeus, where it bifm-cates and 

 runs along the posterior edge of the clypeus, finally reaching the outer 

 margins at the juncture of the clypeus with the eye canthi. Clypeus 

 margined, more arcuate anteriorly. Poorly margined eye canthi form 

 a very obtuse angle with clypeal edge; sides of eye canthi slightly 

 arcuate, almost parallel. Pronotum completely margined, quite 

 convex laterally, coarsely punctured laterally and usually along mid- 

 line but both number and size of the punctures are variable, as are the 

 clusters of punctures which usually form a median cu'cular depression 

 on each side. Minute secondary punctm^es lacking or barely visible 

 near the posterior angles. In many specimens of both sexes the pos- 

 terior half of the pronotal midline is indented, in others the indenta- 

 tion is completely lacking. ScuteUum generally triangular with 

 gradually arcuate sides. Elytra with well developed striae. Punc- 

 tures in striae moderately developed basally, usually becoming vaguely 

 delimited and uneven beyond top of scutellum. Elytral margin 

 narrow, slightly wider anteriorly. 



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

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

 outer margin is expanded forward in the male and somewhat bifurcate 

 at the tip. Also on the inner flattened surface of the foretibia of the 

 males there is an uneven row of 4 to 7 (usually 5) conical teeth. 

 These teeth gradually become larger distally, the apical one being 

 longest (pi. 2, fig. 10). In both sexes there is a dorsal longitudinal 

 raised carina extending along the inner edge of the foretibia. This 

 carina basally has a row of setae parallel and closely adjacent to it. 

 Distally, opposite the penultimate tooth on the outer margin, the row 

 of setae separates from the carina, leaving a smooth area enclosed by 

 carina and setae. These reunite at the base of the distal tooth (pi. 2, 

 fig. 13). External face of tibia of meso- and metathoracic legs each 

 with three complete transverse carinae and two partial ones. Posterior 

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

 claws similar in both sexes. 



Genitalia and genital capsule of male well developed, the dorsal 

 parameres quite distinctive (pi. 4, figs. 4, 5). The most readily 

 discernible characteristic is the basal portion of the right paramere 



