TENEBRIONID^; 187 



and allied species, forming the fourth group; so there is an evident 

 interrelationship, as remarked by Dr. Horn in his paper on the 

 Coleoptera of Baja California. 



Upper surface more or less strongly shining, sometimes alutaceous to 

 moderately opaque 



Upper surface densely opaque; elytra at base never distinctly wider than 

 the thoracic base 6 



2 Elytra not at all margined at the sides, the apex of the humeral angles 

 alone sometimes reflexed and prominent 3 



Elytra with the sides reflexed and cariniform for a varying distance from 

 the humeri, at base much wider than the thoracic base 4 



3 Body very slender and convex, shining; head feebly impressed, 

 coarsely, densely and coalescently punctate; antennae well developed; 

 prothorax very nearly as long as wide, the apex very evidently 

 narrower than the base, deeply, circularly sinuate, the angles 

 anteriorly prominent, very acute and subeverted; base transverse, 

 broadly, feebly sinuate laterally, the angles very acute and obliquely 

 prominent; sides feebly arcuate, broadly sinuate toward the basal 

 and less distinctly near the apical angles; surface evenly convex, 

 only moderately finely, sparsely and strongly punctate, becoming 

 gradually declivo-explanate and coarsely and confluently so laterally, 

 the edge not very thin, not obviously reflexed and rugose; scutellum 

 small; elytra nearly four-fifths longer than wide, three-fifths wider 

 than the prothorax, oval, at base not wider than the thoracic base, 

 widest at the middle, the sides strongly rounded, straight and 

 moderately converging basally, more rapidly converging apically, 

 the apical lobe large but feebly differentiated, the humeral angles 

 slightly obtuse but not at all blunt and minutely, feebly reflexed; 

 surface deeply, rugosely creased, evenly, strongly convex, even 

 though with some broadly obtuse vestigial lines, the punctures 

 minute and sparse; abdomen convex, shining, strongly creased and 

 subscabrous, asperately punctate apically, the prosternum coarsely 

 and closely punctate to the sides. Length (9) 14-2 mm.; width 

 6.0 mm. New Mexico (Magdalena), F. H. Snow. [A si da 



macro, Horn] macra Horn 



Body shorter and more ventricose, the surface smoother; head sub- 

 opaque, feebly impressed, rather coarsely punctate, the punctures 

 perforate and moderately well separated; prothorax nearly as long 

 as wide, more quadrate, the apex but just visibly narrower than the 

 base, otherwise similar, except that the punctures on the declivo- 

 explanate lateral part are not quite so coarse, more perforate and 

 close though much less coalescent; elytra scarcely two-thirds longer 

 than wide, four-fifths wider than the prothorax, the base evidently 

 wider than the thoracic base, more depressed or nearly flat gradually 

 toward the suture, the sides more strongly arcuate, the apical lobe 

 produced and acutely ogival but scarcely at all differentiated; surface 

 smoother, more feebly, very irregularly and closely creased, very 

 minutely and sparsely punctulate, each with obsolete vestiges of 



