64 AMERICAN COLEOPTERA. 



body, piceous. Prothorax scarcely one-half wider than long, narrower at base 

 than apex, scarcely rugose at base ; apex nearly truncate ; median line deep, ab- 

 breviated in front and usually behind; transverse impressions distinct; basal 

 impressions deep, bistriate; sides with the margin distinctly reflexed, arcuate in 

 front, oblique, obsoletely sinuate behind ; hind angles obtuse, but not rounded, 

 carinate. Elytra about one-half wider than the thorax, oblong-oval, moderately 

 deeply striate ; strise entire, impunctate. less deeply impressed at sides and tip, 

 the fifth grooved at apex ; third stria with the first dorsal puncture slightly in 

 front of the middle, the second about one-fourth from apex ; intervals slightly 

 convex. Beneath black, shining. Legs varying from rufo-piceous to piceous. 

 Length .16-. 19 inch ; 4-4.75 mm. 



No description of this species has heretofore been published, I 

 have accordingly adopted the name used by Dr. LeConte in his 

 " List of North American Coleoptera" (Smiths. Misc. Coll., 1863, 

 vi, p. 14) and in his collection, and under which specimens have 

 been distributed by him. 



It is quite closely allied to planiusculmn, but differs by its usually 

 more elongate, less depressed form, with the thorax more narrowed 

 behind and the hind angles obtuse. The basal impressions are less 

 broad and the sides are oblique, or at most only obsoletely sinuate 

 behind. The legs vary from nearly rufous to piceous. 



It is distinctly Northern in its distribution, occurring in Labrador, 

 Canada, the Hudson Bay Territory, New Hampshire, Vermont, 

 Massachusetts and the Lake Superior region, and I have seen one 

 specimen from as far South as Missouri. It has also been taken at 

 Highlands, N. C, by Mr. Blanchard. 



29. D. plaiiiiiscullini Mann. — Form moderately broad, depressed: color 

 nigro-ajneous or Eeueo-piceous, the elytra often more or less brownish, shining. 

 Head scarcely narrower than the thorax at apex; palpi piceous: antennae about 

 one-half as long as the body, piceous. Prothorax about one-half wider than long, 

 scarcely narrower at base than apex, finely rugose at base ; apex truncate; median 

 line deep, abbreviated before and behind; transverse impressions distinct ; basal 

 impressions broad, deep, bistriate; sides with the margin distinctly reflexed, 

 slightly arcuate in front, more or less sinuate behind ; hind angles rectangular, 

 carinate. Elytra about one-half wider than the thorax, oblong-oval, rather finely 

 striate; striae entire, impunctate, the outer ones less deeply impressed, the fifth 

 grooved at tip; third stria with the first dorsal puncture slightly in front of the 

 middle, the second about one-fourth from apex : intervals nearly flat. Beneath 

 black, shining. Legs vaiying from nearly black to rufo-piceous. Length .16- 

 .20 inch; 4-5 mm. 



Broader and more depressed than the preceding, from which it 

 also differs by the sides of the thorax sinuate behind, the hind angles 

 rectangular, and the base scarcely narrower than the apex. 



It exhibits considerable variation in the series before me. The 



