AxMERICAN COMPONENTS OF THE TENTYRIIN^ 347 



very densely and subcoalescently so laterally ; scutellum as in 

 convexiis^ about a sixth or seventh as wide as an elytral base ; 

 elytra nearly as in convexjis^ but, at the middle, much more evi- 

 dently wider than the prothorax, minutely, rather sparsely, con- 

 fusedly punctate, more densely and with the surface less shining 

 and rougher laterally, having unimpressed series of punctures 

 which are fine and scarcely distinguishable suturally but rather 

 coarse, close-set, subscabrous and distinct laterally ; abdomen 

 rather finely but strongly and somewhat closely punctured medi- 

 ally. Length 7.0 mm. ; width 3. iS mm. Arizona (Hardy), — 

 H. F. Wickham nigrans n. sp. 



Form rather stout, oval, polished, glabrous, deep black, the legs rufo- 

 plceous, the form nearly as in ctirtzis but less abbreviated and 

 with the surface more shining; head finely, rather closely punc- 

 tured, scarcely more finely but more densely anteriorly ; prothorax 

 four-fifths wider than long, the deeply sinuate apex much nar- 

 rowed, but little more than two-thirds as wide as the base, a little 

 wider near basal third than at base, the sides evenly arcuate, more 

 converging and less strongly so anteriorly, the basal angles obtuse 

 and blunt, the apical right and bluntly rounded ; surface evenly 

 convex, deeply, closely and not very finely punctate, becoming 

 gradually rather coarsely, densely and subconfluently so laterally, 

 the basal margin perfectly rectilinear throughout ; scutellum trans- 

 verse, broadly-rounded behind ; elytra two-fifths longer than wide, 

 two and one-half times as long as the prothorax and not at all 

 wider, obtusely ogival at apex, the sides rounding at base to the 

 thoracic angles ; surface convex, with subeven, unimpressed, sub- 

 entire series of moderately coarse, not very close-set punctures 

 throughout the width, much more distinct than in curtus^ the in- 

 tervals more finely and confusedly or very unevenly uniseriately 

 punctate; abdomen strongly and closely punctate. Length 5.3- 

 6.0 mm.; width 2.38-3.75 mm. Mexico (Federal District). 



*placidus n. sp. 



8 — Liteguments feebly shining, strongly alutaceous rather than opaque. 

 Body stout, oblong-oval, somewhat strongly convex, black with a 

 feeble piceous tinge, the under surface and legs obscure rufous ; 

 head with close, deep and not very coarse punctures, separated by 

 more than their own diameters, finer and very dense on the epi- 

 stoma, the sides only feebly converging and strongly arcuate, so 

 that they are slightly more prominent than the eyes, the apex 

 broadly sinuato-truncate, the oblique sutures very distinct through- 

 out ; prothorax barely two-thirds wider than long, the apex mod- 

 erately sinuate and two-thirds as wide as the base, the sides evenly 

 converging and evenly, very feebly arcuate throughout ; surface 

 sparsely and extremely minutely punctate, becoming rather ab- 

 ruptly coai'sely and closely, though scarcely coalescently so later- 

 ally, feebly subexplanate near the hind angles, which are slightly 

 obtuse and ])lunt ; scutellum about a seventh as wide as an elytral 



