64 MEMOIRS ON THE COLEOPTERA 



close to the very fine and shorter carina; elytra relatively large, 

 nearly three-fifths wider than the prothorax, parallel, with feebly 

 arcuate sides, obtusely rounded behind; striae fine, scarcely at 

 all impressed and with fine and moderately separated punctures, 

 gradually obsolete toward posterior third, the striae, except the sutu- 

 ral, not entire, the second and fifth deeper at apex; seventh stria 

 obsolete; foveae before basal and before apical third. Length (cf ) 

 4.35 mm.; width 1.65 mm. Colorado (Eldora). . . . scrutatum n. sp. 



Form narrower, the elytra at least one-half longer than wide 33 



33 Prothorax short and transverse; third antennal joint relatively 

 shorter, scarcely a third longer than the second 34 



Prothorax less transverse, more broadly and less prominently rounded 

 at the sides anteriorly; third antennal joint much more elongate in 

 both sexes 35 



34 Form narrow, very moderately convex, polished, black, the legs 

 rufo-piceous; head rather small, narrower than an elytron, the sulci 

 deep, parallel as usual; antennae black throughout, very slender, not 

 quite as long as the elytra, the medial joints between two and three 

 times as long as wide; prothorax three-fifths wider than long; base 

 distinctly narrower than the apex; sides becoming rapidly parallel 

 and straight in basal sixth, the angles but little more than right; 

 surface slightly rugose at base, the impressions very feeble, the stria 

 fine and limited by them; foveae linear, deeply impressed, near the 

 very fine carina; elytra parallel, with feebly arcuate sides, gradually 

 rounded behind, two-fifths wider than the prothorax; striae fine, 

 feebly impressed, finely punctured, nearly as in the preceding, the 

 seventh a series of extremely minute and remote punctures to about 

 apical fourth; foveae at basal and behind apical third. Length (cf ) 

 3.7 mm.; width 1.3 mm. Colorado (Boulder Co.). 



denveranum n. sp. 



Form slightly stouter and rather more convex, polished, black, the elytra 

 castaneous, the legs piceo-rufous; head large, four-fifths as wide as 

 the prothorax and even somewhat wider than an elytron, the bound- 

 ing ridge of the sulci rather prominent; antennae stouter than in the 

 preceding, three-fourths as long as the elytra, black throughout, the 

 medial joints between two and three times as long as wide; prothorax 

 nearly three-fifths wider than long, similarly widest near apical third, 

 the sides becoming parallel only very near the angles, the sinus being 

 broader; surface as in denveraiuim, except that the deep foveae are 

 more briefly oval and not quite so near the short fine carina; elytra 

 rather broader, fully one-half wider than the prothorax, the subpar- 

 allel sides broadly arcuate, the striation and punctures nearly simi- 

 lar, except that the punctures are still smaller and are more close-set 

 in the series; foveae nearer anterior and posterior third. Length ( 9 ) 

 4.2 mm.; width 1.5 mm. Utah tractabile n. sp. 



35 Elytra nearly parallel, longer and with almost straight sides. Elon- 

 gate, only slightly convex, polished, black, the elytra faintly piceous, 

 each with a faint mibilous rounded external spot near apical third; 

 under surface black, the legs bright rufous; head more than three- 

 fourths as wide as the prothorax, but not quite as wide as an elytron; 



