NORTH AMERICAN COLEOPTERA. 207 



Thorax as wide at base as lon^, gradually narrowing to the front, disc moderately 

 convex, carina of the hind angles distinct extending two-thirds to apex, surface 

 moderately coarsely sparsely punctured, the punctures coarser near the hind an- 

 gles and finest near the front angles. Elytra a little wider than the thorax, 

 sparsely irregularly punctate, the punctures much finer than the thorax, a distinct 

 humeral carina above the true epipleural margin. Presternum punctured in 

 front, nearly smooth posteriorly, on each side bistriate, the striae rather deep, ex- 

 tending three-fourths to the front and equal in length ; inflexed sides of prothorax 

 coarsely punctured. Metasternum and abdomen more finely, not closely punctate. 

 Length .16 inch; 4 mm. 



Occurs in Illinois, Greorgia and Maryland. 



D. qiiadripiistiilutus Bonv. — Piceous black, shining, very spansely pu- 

 bescent, each elytron witli a sub-humeral and sub-apical reddish spot, the latter 

 smaller. Head sparsely punctate, antennre piceous. Thorax a little wider than 

 long, gradually narrowed in front, disc moderately coarsely punctate, the punc- 

 tures finer in front, carina of the hind angles short extending but one-third to 

 apex. Elytra a little wider than the thorax, very sparsely and irregularly punc- 

 tate, humeral carina distinct. Prosternum coarsely sparsely punctate in front, 

 smooth posteriorly, on each side bistriate, the strife deep, extending three-fourths 

 to apex, inflexed sides of pronotum coarsely punctate. Metasternum and abdo- 

 men rather finely and sparsely punctate. Length .16 inch; 4 mm. 



This species has a more robust facies than the preceding and is more 

 convex. It diiFers at first sight in color and will be observed to have a 

 much shorter thoracic carina. 



Occurs from Wisconsin to Florida. 



D. iiitidiis Mels. — Piceous black, shining, very sparsely pub.escent. Head 

 sparsely punctate. Thorax as wide at base as long, the sides straight, slightly 

 convergent anteriorly, disc moderately convex, punctures rather sparse at middle, 

 a little coarser and closer near the base, carina long, extending two-thirds to the 

 apex, very close to the margin posteriorly. Elytra a little wider than the thorax, 

 slightly narrower posteriorly, sparsely punctate and more finely than on the thorax, 

 humeral carina distinct. Prosternum sparsely punctate in front, each side bi- 

 striate, the striae extending two-thirds to the front. Flanks of prothorax, sides of 

 metathorax and abdomen moderately coarsely punctured. Length .16 inch ; 4 mm. 

 The only specimen I have seen of this species is the type of Mels- 

 heimer, now in the cabinet of the late Dr. LeConte. It resembles gemi- 

 natits, except that it is entirely piceous, and, as suggested by Melsheimer, 

 may possibly be a variety of that species. 

 One specimen, Pennsylvania. 



I>. riibricollis Lee. — Black, shining, sparsely pubescent, thorax above and 

 beneath red. Head sparsely punctate, antennas piceous. Thorax wider than long, 

 sides arcuately narrowing to the front, disc convex rather coarsely but sparsely 

 punctured, the punctures finer near the front angles, carina of the hind angles 

 short. Elytra very little wider than the thorax, gradually narrower behind, hu- 

 meral carina distinct, surface sparsely irregularly punctate. Prosternum coarsely 

 punctate and piceous in front, posteriorly smooth on each side bistriate, the outer 



