AMERICAN COLEOPTERA. 63 



line readily distinguish this fine species, which is at present 

 rare in collections. The prominence of the posterior spiracles 

 and the length of the terminal spinules of the hind tibiae, 

 mentioned by LeConte, are not characters of importance. 



55. D. carbonata Lee. 



Ovate, black or brownish black, lustre usually dull, sometimes mod- 

 erately shining, elytra distinctly, prothorax minutely alutaceous. 

 Mental declivity distinctly margined. Clypeal margin rounded, feebly 

 or just perceptibly sinuate at middle; clypeal suture nearly straight, 

 distinctly impressed; front moderately convex without impressions, 

 punctuation close. Prothorax three-fourths wider than long, widest 

 at or slightly behind the middle, sides strongly arcuate, angles obtuse; 

 punctuation fine, rather sparse at middle, where the punctures are 

 separated by about twice their own diameters, at sides by their own 

 diameters or less. Elytra two and three-fourths to three times as 

 long as the prothorax, a little wider behind, costas distinct, first inter- 

 costal space with confused punctuation; second and third variable, 

 the punctuation sometimes irregular throughout, at others only so 

 toward the base. Body beneath moderately punctate at sides, the 

 ventral segments nearly smooth at middle. Upper tooth of front 

 tibia a little nearer the base than the apex; ungual tooth strongly 

 post-median, large, obliquely truncate, its tip about two-thirds as far 

 from the tip as from the base of the claw. Length 6-7.5 mm.; width 

 3.5-3.9 mm. 



This species occurs from western Nebraska to Arizona, and 

 is rather common in Colorado and New Mexico; the specific 

 localities represented in the material studied being Ft. Rob- 

 inson, Nebraska; Colorado Springs, Colorado; Luna, Albu- 

 querque, Colora'o and Mesilla Park, New Mexico; Hot Springs, 

 Arizona. 



56. D. rufiola n. sp. 



Closely related to carbonata, with which it agrees so nearly 

 in form, size and sculpture that only the distinguishing char- 

 acters need be mentioned. 



The color is pale rufous; the mental ridge feebler; the prothorax 

 smaller, rather less than one-third as long as the elytra; the punctua- 

 tion beneath, especially of the ventral segments, still sparser and finer- 

 the ungual tooth less stout and more apical, the tip of the tooth fully 

 twice as far from the base as from the apex of the claw. 



TRANS. AM. ENT. SOC, XXXV. MARCH, 1909. 



