AMERICAN COLEOPTERA. 187 



Head, thorax and legs rufous, the latter very rarely piceous; 

 elytra with broad pale margin. 



Elytra piceous with feneous tinge riiscula. 



Elytra brilliant metallic green flilgida. 



Clypeus truncate, angles rectangular triincata. 



Clypeus prolonged in advance of the labrum clypeata. 



Thorax with a rather broad and deeply impressed median groove. 

 Disc of the thorax on each side of median line punctured. 

 Punctures of disc arranged in an even space. 



Outer spur of hind tibiaj %, very much broader than the inner and 



distinctly contorted altoicollis. 



Outer spur of hind tibite % , somewhat broader, not contorted.. valitla. 



Punctures of disc arranged in a broad fovea on each side sulcata. 



Disc of thorax very smooth. 



Clypeus. subtruncate .anteriorly, sides not rounded. Hind tibial spurs 

 slender, similar and equal in the sexes pusilla. 



D. rotundata^ Lee, is omitted from the above table, as it appears to 

 constitute a distinct genus. 



D. clongata. Fab. — Body beneath, head and thorax piceous. Elytra vari- 

 able, testaceous or pieeo-testaceous with an asneous surface lustre of variable 

 intensity but evenly disposed. Head and thorax densely punctured, the former 

 sparsely pubescent, the latter sparsely pubescent % , or densely pubescent J. 

 Clypeal margin moderately reflexed, frontal suture very indistinct, not im- 

 pressed. Scutellum with moderately dense, yellowish white, recumbent pubes- 

 cence. Elytra rather coarsely punctured, sparsely pubescent. Body beneath 

 sparsely punctured, rather densely clothed with long scale-like hairs. Anterior 

 and middle legs and hind femora yellowish testaceous, hind tibiae (except at 

 base) and tarsi jjiceous. 



The sub-apical and basal marginal lines are deeply impressed. The 

 hind tibial spurs are both slender and acute in the two sexes. The 

 pubescence of the thorax is always denser and more persistent in the 

 female, and gives it the appearance of a distinct species, especially as 

 the hind angles of the thorax are less prominent. By an examina- 

 tion of those species in which the hind angles of the thorax are well 

 marked, it will be at once noticed that wliile the males have the thorax 

 sinuate posteriorly and the angles acute, the females have the sides 

 posteriorly obli(|ue, and the angles obtuse or even indistinct. From 

 this it is evident that too great stress must not be laid on the form of 

 the thorax in the attempt to separate species. 



This species occurs rather abundantly from Canada to the Middle 

 States. 



I>. Slibvlttata, Lee. — Color testaceous, elytra with distinct asneous tinge, 

 frequently with a darker vitta extending from the humeral to the apical 

 unibone with the color always more densely aeneous at these points. Head 

 rugoscly punctured, sparsely pubescent, frontal suture nearly obliterated. 



