48 H. C. FALL. 



the front angles distinctly more acutely produced. Exam- 

 ples of this form are known to me from Garland and Fort 

 Collins, Colorado; southwestern Utah and New Mexico. 



Var. compacta n. var. — More robust than typical obscura, 

 color usually blackish brown, sides of thorax less arcuate as 

 in prominens, but the front angles not at all prominent. The 

 typical variety has been seen only from Utah ; some examples 

 from Wyoming, however, approach it rather more nearly than 

 they do the true obscura. 



34. D. tristis Kirby. 



Moderately elongate, parallel, piceous or blackish brown, elytra 

 minutely alutaceous but shining. Mentum nearly as in obscura. 

 Clypeal margin sinuato-truncate with rounded angles, clypeal suture 

 feebly sinuous, post-clypeal convexity and frontal impressions broad 

 and faint, punctuation moderately close, the suture usually narrowly 

 smoother Prothorax very slightly less than twice as wide as long, 

 widest at base, sides broadly arcuate, often subparallel basally; front 

 angles feebly prominent, hind angles subrectangular as viewed from 

 above; punctuation not coarse, moderately close, a little closer laterally 

 as usual, angles feebly impressed. Elytra almost one-half longer than 

 wide, and rather more than three and one-half times as long as the 

 prothorax; discal costae distinct, very slightly convex, intercostal 

 confusedly punctate. Body beneath sparsely and finely punctate at 

 middle, not very closely nor coarsely at sides. Pygidium without 

 trace of median impressed line. Upper tooth of front tibia evidently 

 more remote from the base than from the apex; hind thighs rather 

 numerously and strongly punctate at middle; ungual tooth strongly 

 post-median, broad, truncate, its tip nearly twice as far from the base 

 as from the end of the claw. Length 12-14 mm.; width 6.3-7 mm. 



Habitat. — Maine; New Hampshire; Massachusetts; New 

 York; Pennsylvania (Areola); Ontario (Port Hope); Michigan 

 (Escanaba, Marquette) ; Kansas (Junction City) . This last 

 named locality is exceptional, and it is probable that the 

 species occurs very rarely so far west. Kirby's types are said 

 to have been collected in latitude 54° ; he also reports it as 

 occurring in Nova Scotia. 



35. D. liberta Germ. 



The description of tristis applies 'so well to this well-known 

 eastern species that it is merely necessary to allude to the few 

 distinguishing characters. The color is uniformly black or 



