282 CHRIS. H. ROBERTS. 



Group B. 



Femora of % not toothed. 

 Size medium ; surface black, not polished, sometimes lironzed. 



Anterior tibiie ori-jffin.iiiy broadened from base to apex, tip oblique, exterior 

 angles obtuse. ..• liornii. 



Group C. 



Under surface black, shining, usually bi'onzed. 

 Femora of % not toothed. 



Size medium, form robust ; apices strongly depressed, not dehiscent at suture. 

 Anterior tibife regularly broadened from base to apex, exterior angle acute. 



produced nigrior. 



Size medium, form more slender; apices not strongly depressed, dehiscent at 

 suture. 

 Anterior tibise regularly broadened from base to apex, exterior angle rect- 

 angular assiiiiiliw. 



Femora of % toothed. 

 Size small ; apices dehiscent at suture, sutural angles evident, produced. 

 Anterior tibifp cylindrical at basal third, then rather suddenly broadened 

 and continuing nearly parallel to apex, exteinor angle acute, produced. 



prodiictiis. 

 Under surface brown or testaceous; femora of % toothed. 

 Apices of elytra serrulate. 



Size medium to small ; surface very highly polished, not bronzed, strongly 

 narrowed in front; under surface chestnut-brown, serration distinct. 



serriilatii!>i. 

 Size medium: surface not highly polished, bronzed, moderately narrowed in 



front; under surface pitchy-brown, serration fine analis. 



Apices of elytra not serrulate. 



Size moderately large ; broad, narrowed in front, surface metallic shining; 



under surface and legs testaceous to straw color <Ii^color. 



Size small; narrow, very convex, surface polished black; under surface and 

 legs rufous aiigustus. 



Group A. 

 D. vittatus Aube. Plates v, vi, figs. 1, !« and 16. — Size large, regulaiiy oval, 

 feebly convex ; surface black, very shining, obsoletely punctate, striae faint, more 

 evident at sides ; a subniarginal bronze vitta extends across the thorax and nearly 

 to apex of the elytra; lateral margins of elytra not sinuate, depressions not deep, 

 sutural angles broadly rounded ; under surface dark brown or pitchy, middle and 

 jjosterior tibiae and tarsi paler; anterior tibiae sinuate, apex truncate, or very 

 slightly oblique, exterior apical angle rectangular; femora without tooth, punc- 

 tures (six % , seven 9 ) not deep or closely placed. Length 12-15.5 mm. ; breadth 

 8 10 mm. 



Hab. — North, Middle and South Atkiiitic States, Indian Territory, 

 Mexico (one specimen U. S. Nat. Mus.). 



Readily recognized on account of its large size, very shining aj)- 

 jjearance and the bronze vitta. 



