AMERICAN COMPONENTS OF THE TENTYRIIN^ 297 



parallel toward the eyes, the punctures very coarse, deep and 

 close-set, the occipital spot feeble; prothorax fully three-fourths 

 wider than long, the sides evenly, rather strongly arcuate, but 

 little more converging anteriorly, the basal angles obtuse, not 

 rounded or prominent, the punctures coarse, perforate, unevenly 

 distributed but generally rather close-set, becoming rather abn/^tly 

 still coarser, dense and sabconfluent in lateral fifth or sixth ; 

 scutellum moderate, transverse ; elytra three-fifths longer than 

 wide, as wide as the prothorax and about three and one-half times 

 as long, rather gradually and not very obtusely ogival behind, the 

 punctures rather small but strong, sparse and for the most part 

 confused toward the suture, coarse, muricate and close-set in 

 series laterally, the interstitial punctures subequal to the serial, 

 more widely spaced in tolerably regular single series except 

 towai-d the suture; abdomen finely rugulose, finely but strongly, 

 moderately sparsely punctured medially. Length 7.3 mm. ; 

 width 2.75 mm.' Arizona (southern), — Morrison. 



carbonatum Csy. 



Form more slender, elongate, parallel, moderately convex, polished, 

 deep black, the legs and antennae rufous ; head well developed, 

 moderately coarsely, regularly and not very densely punctate, the 

 occipital spot large but ill-defined, the sides moderately con- 

 verging and strongly arcuate but not quite becoming parallel near 

 the eyes; prothorax three-fifths wider than long, the sides 

 moderately arcuate, becoming more strongly convergent and 

 nearly straight at apex, the basal angles obtuse, not rounded but 

 not at all prominent, the punctures not notably coarse but deep 

 and sparse medially, becoming rather rapidly coarse, dense and 

 subcoalescent in about lateral fifth; scutellum moderate, punctate 

 at base; elytra fully two-thirds longer than wide, barely per- 

 ceptibly wider than the prothorax and a little more than three 

 times as long, gradually parabolic at tip, the punctures moderately 

 close-set in rather regular series throughout, fine suturally, 

 moderately coarse laterally, the interstitial punctures similar, 

 forming single series, confused only on the sutural interval ; 

 abdomen feebly rugulose, minutely, sparsely punctate medially. 

 Length 7.0 mm.; width 3.5 mm. Arizona (Phoenix). 



procerum n. sp. 



Form very slender as in procerutnund similar in lustre and coloration ; 

 head relatively somewhat larger, between three-fifths and two- 

 thirds as wide as the prothorax, the sides less converging and 

 still more strongly arcuate, becoming almost parallel toward the 

 eyes, the punctures deeper, rather coarse, separated generally by 

 their own widths, the occipital smooth space obsolete and 

 occupied by sparser punctures; prothorax much shorter, nearly 

 three-fourths wider than long, the sides moderately arcuate, 

 becoming more convergent and subsinuate anteriorly, the basal 

 angles nearly right and minutely prominent, the punctures fine 

 and rather sparse medially, much finer than in procerii7n^ becom- 

 Proc. Wiish. Acad. Sci., August, 1907. 



