AMERICAN COMPONENTS OF THE TENTYRIIN^ 357 



much less obtuse, the punctures simihu-ly strong, close-set and sub- 

 equal throughout, not at all different toward the sides but becom- 

 ing noticeably sparser toward the apical angles than elsewhere, a 

 character not noticeable in tJwracicus ; scutellum much smaller; 

 elytra nearly similar and similarly punctate but fully as wide as 

 any part of the prothorax ; abdomen feebly rugulose, shining, 

 strongly and not sparsely punctate. Length 6.S mm. ; width 2.7 

 mm. California (probably southern) exoletus n. sp. 



Form nearly similar but smaller, feebly shining, the elytra opaque, 

 piceous-black, the legs pale and bright rufous ; head notably larger, 

 slightly broader than an elytron, dull, the punctures rather small 

 but perforate and very close-set, the sides converging and arcuate, 

 the apex very broadly, feebly and subevenly arcuate throughout, 

 the antennae shorter and stouter than in either of the preceding 

 species ; prothorax scarcely more than one-half wider than long, 

 the moderately sinuate apex evidently narrower than the base, the 

 subparallel sides very moderately, subevenly arcuate, the apical 

 angles rather deflexed, right, the basal very obtuse as in t/ioraciats^ 

 the adjoining surface even ; punctures strong, perforate and close- 

 set, becoming but slightly coarser and very close though scarcely 

 coalescent laterally ; scutellum moderate, transverse, impunctate 

 except sparsely at base ; elytra barely one-half longer than wide, 

 less than three times as long as the prothorax and equal in width, 

 the punctures of the irregular series much finer than in the two 

 preceding, rather close-set, those of the intervals minute and sparse, 

 in great part confused ; abdomen very finely, sparsely punctate 

 medially. Length 5.3 mm.; width 3.3 mm. California (San 

 Bernardino Co.) sterilis n. sp. 



10 — Basal margin of the elytra oblique and nearly straight from the 

 scutellum to the humeral angles ; sides of the prothorax parallel 

 and subevenly arcuate thi'oughout. Middle coast regions of 

 California 11 



Basal margin of the elytra strongly flexed anteriorly toward the humeri ; 

 prothorax more evidently narrowed apically in anterior half. 

 Colorado and New Mexico I3 



II — Body rather stout, strongly convex, polished throughout, deep 

 black, the legs clear rufous ; head somewhat coarsely, very deeply 

 and closely punctate, equal in width to an elytron, very broadly 

 arcuate throughout the apex, the sides converging and evenly, 

 strongly arcuate ; prothorax about two-thirds wider than long, the 

 sides rather feebly arcuate, straight toward base, the angles obtuse, 

 the apical angles rather deflexed, obtuse and blunt, the punctures 

 fine but strong, rather sparse, becoming only slightly coarse and 

 closer but still well separated laterally; scutellum small; elytra 

 inflated behind the middle, scarcely one-half longer than wide and 

 less than three times as long as the prothorax, but, behind the 

 middle, at least a sixth wider, the sides broadly arcuate, the apex 

 acutely ogival, the punctures moderately large, widely spaced in 



