156 MEMOIRS ON THE COLEOPTERA 



very convex, narrowing inferiorly and with the oblique lower part 

 of the anterior margin somewhat sinuate; a narrow deep groove, 

 coarser above, borders them anteriorly. The antennae are rather 

 more slender than usual, gradually dilated distally to the tip of the 

 tenth joint, and are strongly compressed throughout and not alone 

 apically as in most of the preceding groups. The convexicollis 

 group is confined apparently to the Rocky Mountain region and 

 slightly to the eastward from Nebraska to northern Mexico. 



Prothorax virtually as long as wide. Body black, shining, the convex 

 prothorax obsoletely punctulate, more distinctly at the sides, which 

 are rounded and finely margined, the angles all obtuse, not at all 

 prominent, the base rounded; elytra obovate, much wider than the 

 prothorax, especially in the female, the sides not at all margined, 

 the apex strongly declivous and obtusely acuminate, sparsely punc- 

 tulate and sparsely, finely rugose. Length 15.8-21.2 mm. [prob- 

 ably including a mixture of allied species and subspecies]. Found 

 at various localities along the southern boundary of New Mexico. 



convexicollis Lee. 



Prothorax much wider than long 2 



2 Elytra nearly even. Form stout, the hind body inflated, deep black, 

 rather shining, glabrous as usual; head deeply and rather acutely 

 impressed transversely, strongly, rather closely punctate anteriorly, 

 each puncture with a short erect seta, finely and sparsely on the 

 vertex, with the punctures nude, the eyes only moderately convex; 

 antennae (9) rather long, as long as the prothorax, strongly com- 

 pressed; prothorax a little less than two-thirds as wide as the elytra, 

 nearly one-half wider than long, the apex feebly, evenly sinuato- 

 truncate, somewhat narrower than the base, which is strongly and 

 broadly lobed, becoming narrowly and feebly sinuate near the angles, 

 which are obtuse but not blunt and feebly prominent, the apical 

 angles not at all advanced, right and scarcely at all blunt; sides very 

 evenly and moderately arcuate throughout; surface evenly and 

 strongly convex, subopaque, minutely but perforately, sparsely 

 punctulate, the gradually very steep sides becoming strongly but not 

 densely punctate near the feebly cariniform margins; scutellum well 

 developed, broadly triangular; elytra two-thirds longer than wide, 

 widest at three-fifths, oboval, with rather strongly rounding sides, 

 the latter more rapidly rounding behind, the apical lobe small and 

 obtuse; surface even, smooth, broadly, feebly impressed along the 

 suture except basally and at apex, shining, feebly, sparsely, impres- 

 sedly-creased and minutely, remotely punctulate, the side margins 

 evident as a subacute line to apical fourth, the line very well defined 

 but not cariniform, except very near the basal angles, where it 

 becomes acutely elevated and cariniform and bordered internally 

 by a deep depression; abdomen strongly alutaceous, very minutely, 

 remotely punctulate; legs very slender and rather long, strongly 

 sculptured. Length (9 ) 19.0-22.6 mm.; width 9.0-11.6 mm. New 

 Mexico, Schaupp inhabilis n. sp. 



