AINIERICAN COMPONENTS OF THE TENTYRIIN^ 321 



densely, somewhat coarsely, muricately punctate, the sides con- 

 verging and straight before the eyes; prothorax only moderately 

 transverse, but little more than three-fourths wider than long, 

 distinctly narrowed but rather feebly sinuate at tip, the sides 

 evenly and rather strongly arcuate, the disk widest somewhat 

 behind the middle, opaque, minutely and closely but somewhat 

 irregularly punctate, somewhat coarsely, densely and muricately 

 toward the side; elytra fully one-half longer than wide, barely 

 three times as long as the prothorax and only slightly wider, more 

 shining, obtusely rounded at apex, parallel, with the sides feebly 

 and evenly arcuate, the serial punctures rather strong and close- 

 set, those of the intervals uneven in arrangement and smaller. 

 Length 5.3 mm.; width 2.2S mm. Arizona compar n. sp. 



Form oblong, dilated behind, short and stout, piceous-black, the legs 

 and sterna rufous; head opaque, closely punctato-scabrous, the 

 sides converging and nearly' straight but with the angles broadly 

 rounded at apex; prothorax very short, fully twice as wide as 

 long, sinuate but only slightly narrowed at apex, the sides rounded 

 but becoming .straight or subsinuate apically, widest at the middle, 

 the surface only alutaceous, more shining than in compar^ the 

 punctures comparatively coarse and separated b}' fully twice their 

 own diameters, becoming but little coarser though dense and 

 scabrous laterally; elytra short, two-fifths longer than wide but 

 rather more than three times as long as the prothorax, obtusely 

 ogival at apex, at apical third much wider than toward base, 

 where they are but little wider than the prothorax, the serial 

 punctures coarse and close-set, becoming gradually much smaller 

 posteriorly, the interstitial punctures only a little smaller but 

 sparser and uneven; abdominal sculpture strikingly coarse. 

 Length 4.:; mm.; width 2.1 mm. Arizona (Tu9Son). 



curticollis n. sp. 



Form narrow, convex, parallel, much smaller in size, piceous-black, 

 the under surface rufo-piceous, the legs rufous; head trapezoidal, 

 finely, closely and muricately punctate, the epistoma j^rojecting 

 only very slightly beyond the lateral lobes and very broadly, rec- 

 tilinearly truncate, the converging sides before the eyes almost 

 straight ; prothorax alutaceous, twice as wide as long, nearly 

 parallel, the moderately sinuate apex but little narrower than the 

 base, the sides evenly, rather strongly arcuate, the basal angles 

 very obtuse ; punctures fine and well separated medially, be- 

 coming larger, dense and confusedly rugulose laterally ; scutellum 

 well developed, punctured basally ; elytra one-half longer than 

 wide, somewhat more than three times as long as the prothorax 

 and sensibly wider in the male, rapidly and obtusely parabolic at 

 tip, the sides parallel and feebly arcuate, the humeri only just 

 visibly exposed at base ; surface rather smooth and alutaceous, 

 the series of close-set punctures distinct and not very coarse or 

 strongly muricate, almost entire, unimpressed, the punctures of 

 the intervals but little smaller, thougli feebler and more widely 



