120 MEMOIRS ON THE COLEOPTERA 



Mentum edentate or with a broad obtuse and very feeble tooth; thoracic 

 angles sharply marked, not rounded 22 



12 Thoracic base rectilinearly transverse medially, posteriorly oblique 

 at the sides, so that the basal angles are more posterior in position 

 than the medial part as in the preceding section; color of the body 

 always notably pale castaneo-testaceous even apparently when 

 mature; antennae slender, the general affinities strongly with the 

 preceding three species 13 



Thoracic base transverse and, although sometimes feebly bisinuate, 

 never having the hind angles more posterior than the medial parts; 

 coloration always darker, generally nearly or quite black 16 



13 Sides of the prothorax but feebly arcuate and more parallel than in 

 the preceding or following species, the base and apex subequal in 

 width; thoracic foveae larger and with conspicuous diffuse punctua- 

 ation. Body elongate-oval, convex, shining, testaceous, the elytra 

 (9) but little more obscure and strongly shining, barely visibly 

 alutaceous; head smooth, the eyes unusually developed, prominent, 

 the foveae very minute, feeble, sublinear; prothorax slightly more 

 than two-fifths wider than long, quadriform, the apex broadly and 

 feebly sinuate, with moderately rounded angles, the basal bead 

 strong; sides nearly straight posteriorly, the angles right but evi- 

 dently though not broadly rounded; surface very steeply declivous 

 at the sides anteriorly to the deep and moderately finely re flexed 

 edge, which is punctulate to the base, not dilated posteriorly and 

 obsolete at about basal third; surface between the large impressed 

 foveae and the sides feebly convex and impunctate; stria very fine; 

 elytra oval, very convex, barely two-fifths longer than wide, nearly 

 a fourth wider than the prothorax, with rather strongly arcuate 

 sides and gradually obtusely ogival apex, the sinus barely evident; 

 striae fine, slightly impressed, the intervals feebly and subequally 

 convex throughout the width, the puncture near apical third; 

 accessory setae of the abdomen very few in number; hind tarsi very 

 slender, the basal joint not so very much shorter than the fifth as 

 it is in most of the following forms of this section, being fully four- 

 fifths as long. Length (9 ) 8.8 mm.; width 3.5 mm. New Mexico 

 (Socorro Co.), Snow clientus n. sp. 



Sides of the prothorax strongly arcuate, more converging and straighter 

 posteriorly, the apex obviously though not greatly narrower than 

 the base and very feebly sinuate, with moderately rounded angles, 

 the thoracic foveae small, linear, very feeble and impunctate or very 

 nearly; hind tarsi very slender and moderately long but with the 

 first joint very distinctly shorter than the fifth 14 



14 Elytra almost circularly rounded behind, the sinus virtually ob- 

 solete. Body unusually slender, moderately convex, elongate- 

 suboval, very shining, fusco-testaceous in color, the elytra barely 

 more obscure; head with relatively rather less developed or prominent 

 eyes than in clientus and with the foveae small but perforato-puncti- 

 form; prothorax rather more than two-fifths wider than long, the 

 base finely beaded, with the angles slightly obtuse and notably 

 rounded; fine lateral gutter expanding, inclined but extremely feeble 



