i8o MEMOIRS ON THE COLEOPTERA 



Body deep black in color; elytral ridges not fimbriate, all exactly parallel 

 with the suture 2 



2 Form rather stout, strongly convex, oblong-oval, rather shining; 

 head broadly and deeply impressed transversely, rather strongly, 

 closely punctate anteriorly, more opaque and minutely, sparsely 

 punctate basally; antennae rather slender, black, the joints eight 

 to ten gradually wider; prothorax fully three-fourths wider than its 

 median length, widest behind the middle but with the sides very 

 evenly and moderately arcuate; apex much narrower than the base, 

 very deeply sinuate, the angles slightly blunt at tip; base transverse, 

 very feebly and broadly sinuate at each side, the angles slightly 

 obtuse and blunt; surface evenly and moderately convex, subopaque, 

 minutely, rather sparsely punctate, with a feebly denned impunctate 

 line, the punctures gradually becoming stronger but not notably 

 coarse and still sparse laterally, the sides abruptly and very steeply 

 reflexed, the reflexed part flat, coarsely, subrugosely punctate, the 

 edge thin, the pubescence fulvous and minute throughout, subde- 

 cumbent; scutellum moderate; elytra virtually glabrous, oblong-oval, 

 parallel, broadly and evenly rounded at the sides, two-thirds longer 

 than wide, two-fifths to one-half wider than the prothorax, the apical 

 lobe very protuberant and narrowly parabolic; surface decidedly 

 shining, unevenly creased and subrugose, very minutely, sparsely, 

 subgranularly punctulate, the suture but feebly tumescent, the first 

 two ridges obsolescent basally, uniting at apical fifth and thence con- 

 tinued posteriorly for a short distance as a single feeble ridge, the 

 third extending from the margin near the base to apical sixth, free' 

 at the end, the margin obtusely costate and unevenly, granularly 

 rugose; humeri obliquely rounded; abdomen alutaceous, minutely, 

 sparsely, asperulately punctulate; legs short, slender, with short stiff 

 black hairs. Length 12.8-13.2 mm.; width 6.6-6.8 mm. Arizona 

 (Huachuca Mts.) ignava n. sp. 



Form more slender, similarly convex but more opaque and with more 

 distinct fulvous hairs; head and antennae nearly similar but with the 

 punctures smaller, feebler and sparser, though extending posteriorly 

 to the vertex; prothorax similar, except that the small punctures 

 are more distinct and rather closer, becoming much coarser and closer 

 laterally, without evident impunctate line and the fulvous hairs 

 longer and much more conspicuous, the sides similar but with the 

 steep flat reflexed part relatively even higher, the edge thicker; 

 elytra narrower and more elongate-oval, with more arcuate sides, 

 opaque, otherwise similar, except that the surface is more evidently 

 though minutely fulvo-pubescent, the ridges narrower at their sum- 

 mits and less widely separated, and that the first joins the third at 

 apical seventh, the second abbreviated and free at the end or some- 

 times tending to join the first; abdomen more shining, the minute 

 punctulation sparser; legs very slender but relatively a little longer. 

 Length 11.5 mm.; width 5.7 mm. Arizona (locality unrecorded). 



impotens n. sp. 



There are doubtless a number of other species of this group in 

 southern Arizona and northwestern Mexico. 



