134 MEMOIRS ON THE COLEOPTERA 



transversely impressed, coarsely, deeply, rather closely punctate, a 

 transverse region between the eyes nearly free from punctures; 

 antennae stout, nearly as long as the prothorax, notably compressed 

 distally; prothorax large, nearly one-half wider than long, broadly, 

 evenly convex and with small sparse punctures except abruptly at the 

 sides, the basal impression moderate, concave; elytra twice as long 

 as wide, scarcely at all wider than the prothorax, feebly and almost 

 evenly arcuate at the sides, broadly and moderately convex, widest 

 at or slightly behind the middle, the apex obtusely and briefly 

 lobed from above; surface with fine and feeble creases and with 

 rather small, sparse and notably feeble punctures, the side margin 

 from about the middle narrowly reflexed basally; abdomen shining, 

 deep black, not punctate, except moderately toward the tip but 

 everywhere with fine anastomosing creases; legs long, rather slender, 

 the tarsi thick, moderately short. Length (d 71 ) 30.0 mm.; width 



12.3 mm. Arizona pollens n. sp. 



A Similar to the preceding throughout in coloration, lustre and 

 sculpture but notably more abbreviated, with the pronotal im- 

 pression subobsolete, the elytra about one-half longer than wide, 

 more inflated behind and nearly one-half wider than the pro- 

 thorax, the acute side margin not extending to the middle, the 

 abdomen with the apical punctures finer and sparser, the legs 

 rather shorter, notably more sparsely sculptured and with the 

 tarsi relatively longer and more slender in both sexes, the 

 antennae much more slender. Length (cf, 9) 24.0-27.0 mm.; 



width 12.3-12.8 mm. Arizona proximus n. subsp. 



Body similar but black throughout, alutaceous, the pronotal punctures 

 still sparser, the elytra (9 ) rather more convex, less inflated, more 

 evenly oval, widest at the middle, two-thirds longer than wide, two- 

 fifths wider than the prothorax, the sparse punctures similarly 

 indefinitely impressed and very feeble, the side margins still shorter, 

 extending but little beyond basal third; pronotal impression distinct 

 as in pollens; abdomen as in proximus, the legs as in pollens, except 

 that the tarsi are evidently a little longer and more slender. 

 Length (9) 27.0 mm.; width 11.7-12.8 mm. Arizona. 



brevimargo n. sp. 



5 Form more slender, with relatively smaller prothorax than in any of 

 the preceding, rather shining or feebly alutaceous, piceous-black, 

 the elytra piceo-rufous, the under surface and abdomen shining, 

 black; head less deeply impressed, less coarsely and more sparsely 

 punctate; prothorax similar in general form but with the parallel 

 sides evenly, though much less strongly, arcuate, the deeply sinuate 

 apex broader, less markedly narrower than the base, similarly finely, 

 sparsely punctate and broadly, evenly, convex, but with the basal 

 impression broader, more feeble and diffuse, transverse and border- 

 ing, not involving, the margin, somewhat as in the next group 

 though differing in being at the bottom of a basal declivity and not 

 on the same plane as the surface anterior thereto; surface also with 

 a very vague and feeble impression near each lateral fourth just 



