AMERICAN COLEOPTERA. 53 



middle; frontal impressions variable, rather deep in typical form, but 

 often shallow and feebly marked. Prothorax three-fifths (more or less) 

 wider than long, sides strongly rounded a little behind the middle, 

 usually slightly sinuate before the front angles, all the angles well 

 defined, but obtuse as viewed from above; disk evenly convex, the 

 anterior lateral fovea often well marked; punctuation rather sparse, 

 the punctures separated by about their own diameters at sides, less 

 close at middle. Elytra a little more than two and one-half times as 

 long as the thorax, slightly wider behind, costae indistinct, the punc- 

 tures arranged in nearly regular lines, except in the broad subsutural 

 interspace; second intercostal and humeral intervals with the punc- 

 tures sometimes a little irregular especially toward the base. Body 

 beneath sparsely punctate at middle, more closely at sides. Upper 

 tooth of front tibia a little nearer the base than the apex; hind thighs 

 sparsely punctate at middle, the punctures usually arranged in a more 

 or less irregular line; claws with an obliquely truncate tooth beyond 

 the middle, its apex about two-thirds as far from the tip as from the 

 base of the claw. Length 6.4-9 mm.; width 3.3-4.6 mm. 



This subspecies in one form or another occurs more or less 

 abundantly over a wide range of territory, being found from 

 Kansas and Texas through New Mexico and Arizona to Cal- 

 ifornia, and north to British Columbia and Idaho. The very 

 large material studied bears the following labels: — Kansas; 

 Texas; New Mexico (Albuquerque, Mesilla, Las Cruces, Dem- 

 ing) ; Arizona (San Simon, Oracle, Tucson, Ft. Grant, Globe, 

 Florence, Gila Bend, Willcox, Winslow, Phoenix) ; Utah (Salt 

 Lake, St. George) ; California (Salton, Death Valley, Lan- 

 caster, Redlands, Pomona, Yreka) ; Washington (Wenatchee) ; 

 Idaho (Pocatello) ; British Columbia (Kamloops). 



42. D. atratula Lee. 



Moderately robust, black, elytra brownish-black, lustre somewhat 

 dull, the elytra with distinct and the thorax with visible alutaceous 

 sculpture. Mentum declivous from anterior two-fifths, marginal ridge 

 and setse well developed. Clypeus less produced than in californica, 

 but rather more deeply sinuate at middle, the sides broadly rounded, 

 without sinus before the eye; head densely punctate, post-clypeal 

 convexity well marked but without frontal excavation, there being 

 only the vaguest sort of impressions above the convexity. Prothorax 

 nearly as in carbonata, two-thirds wider than long, sides nearly straight 

 anteriorly, rounded at posterior two-thirds, front angles slightly 

 advanced, punctuation dense at sides, less close at middle where the 

 punctures are separated by their own diameters or a little less. Elytra 



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



