AMERICAN COLEOPTERA. 41 



part nearly four times as wide as the sutural interspace. Body be- 

 neath sparsely punctate at middle; the metasternum subimpunctate; 

 sides moderately punctate; hind coxal plates sparsely punctate; hind 

 femora smooth at middle. Upper tooth of front tibia midway be- 

 tween apex and base. Ungual tooth median in position, its apex as 

 far from the tip as from the base of the claw. Length 9-13 mm.; 

 width 4.7-6.S mm. 



The types of this species were taken on the Yellowstone 

 River by Dr. F. V. Hayden. It is a common species in the 

 Rocky Mountain region, especially toward the north. 



The following localities are represented in the material 

 before me: Helena, Assiniboine and Glendive, Montana; Lar- 

 amie, Wyoming; Pueblo and Greeley, Colorado; Williston, 

 North Dakota; Kansas; Nebraska; Las Vegas and Gallinas 

 Hot Springs, New Mexico; Arizona (one example in Bowditch 

 collection) . 



Haydenii is very closely related to levicoxa, but the hind 

 coxal plates are here always somewhat punctured, the size 

 is smaller, the color very uniformly rufotestaceous (blackish 

 in levicoxa), the front angles of the prothorax a little more 

 prominent, and the sides of the body beneath are less coarsely 

 punctate. 



The innoxia of LeConte does not differ specifically. 



27. D. dentella n. sp. 



Moderately robust, slightly or scarcely wider behind; black, more 

 rarely castaneous or rufous, shining, the elytra barely visibly aluta- 

 ceous. Mentum nearly as in belfragei except that the anterior de- 

 clivity begins farther forward. Clypeus densely punctate, margin 

 sinuato-truncate with rounded angles; front closely punctate, clypeal 

 suture not or but very narrowly smoother; post-clypeal convexity 

 and the posteriorly adjacent impression faint. Prothorax not quite 

 twice as wide as long, broadly rounded anteriorly, subparallel and 

 slightly sinuate behind the middle; hind angles nearly rectangular as 

 viewed from above, punctures distant from one to three times their 

 own diameters, averaging a little closer laterally. Elytra one-third 

 longer than wide and about three times as long as the prothorax; 

 costas rather indistinct, the first intercostal space at middle scarcely 

 more than twice as wide as the sutural interval, and with confused 

 punctuation; second and third intercostal spaces narrow, the punc- 

 tures often arranged in nearly regular series, but sometimes more 

 plainly confused. Metasternum nearly smooth at middle, moderately 



TRANS. AM. ENT. SOC. XXXV. (6) FEBRUARY, 1909. 



