164 MEMOIRS ON THE COLEOPTERA 



high marginal bead; elytra nearly three-fourths longer than wide, 

 widest only slightly behind the middle, oval, the sides strongly 

 rounded, becoming nearly straight basally, the general form remind- 

 ful of the preceding section of the group; ends of the basal margin 

 feebly dentiform, the carinule wholly wanting; surface rather 

 shining in both sexes, very closely, deeply creased and rugulose, 

 finely but strongly, sparsely punctate throughout, more coarsely and 

 irregularly toward the suture, the inner vestigial costule feeble; 

 abdomen shining, the legs very slender. Length (c?) 18.5 mm.; 

 width 9.0 mm. New Mexico (Magdalena Mts.), F. H. Snow. 



congruens n. sp. 



A Similar in general form to congruens but much more shining and 

 more feebly sculptured, the sides of the elytra becoming almost 

 straight basally, black, the elytra piceous-brown; head rather 

 sharply impressed transversely, coarsely, rather closely punctate, 

 finely and sparsely so on the vertex; antennae much longer than 

 the prothorax, rufo-piceous distally; prothorax as in congruens, 

 except that the coarsely and sparsely punctured sides are much less 

 narrowly and more deeply concavo-explanate and the surface 

 more alutaceous in the male, the marginal bead very thin and 

 high; elytra similar in form, more than one-half wider than the 

 prothorax but very smooth and evenly convex throughout the 

 width, highly polished, with the vestigial costules evident, the punc- 

 tures very fine and sparse, more evident and unequal suturally, 

 the creases very fine and sparse, the humeral carinule very short 

 and rapidly obsolete though quite evident, the sides of the base 

 scarcely at all prominent; abdomen alutaceous, finely creased, 

 distinctly and rather closely punctured apically; legs very slender. 

 Length (cf) 18.5 mm.; width 8.6 mm. Arizona (locality unre- 

 corded) lubricus n. subsp. 



1 1 Body rather large and narrow, gradually dilated posteriorly, deep 

 black throughout; head rather shining, feebly impressed transversely, 

 more strongly at the sutures, strongly, not closely and rather un- 

 evenly punctate; antennae longer than the prothorax even in the 

 female; prothorax relatively well developed, nearly one-half wider 

 than long, two-thirds as wide as the elytra, subparallel, evenly and 

 somewhat strongly rounded at the sides, the apical angles but slightly 

 blunt, the basal moderately obtuse, very distinct, the basal sinuses 

 broad and extremely feeble; surface subopaque, moderately convex, 

 minutely, sparsely punctulate, rather abruptly and distinctly 

 concavo-explanate and sparsely and strongly punctate laterally, 

 the edge strongly elevated and thin; elytra about three-fifths longer 

 than wide, widest but little behind the middle, the sides strongly 

 arcuate, becoming strongly convergent and broadly sinuate basally, 

 the apical lobe small, moderately distinct, the humeral carinule 

 wanting, the ends of the basal margin feebly dentiform and promi- 

 nent; surface strongly shining, broadly flattened or slightly impressed 

 medially, the sutural region narrowly and feebly tumescent, the 

 vestigial costules obsolete, the creases feeble and the punctures 



