AMERICAN COMPONENTS OF THE TENTYRIIN^ 387 



sion before the scutellum, the latter wider than long and very ob- 

 tusely ogival ; elytra elongate, very gradually and acutely pointed 

 behind, the angles acute but not mucronate, the humeri broadly 

 rounded to the prothorax, the surface with a few feebly impressed 

 lines suturally, very finely, sparsely punctured, less finely but not 

 very closely laterally, the punctures confused but with some traces 

 of slightly larger punctures, either in irregular single series or in 

 longitudinal aggregated lines. Length lo.o-ii.o mm.; width 

 4.0-4.35 mm. Mexico (Guerrero) *gracileCsy. 



Form elongate-ovoidal, moderately convex, deep black with scarcely 

 any metallic lustre, rather shining, the pubescence very short, 

 sparse and inconspicuous ; head somewhat finely and sparsely 

 punctate, the punctures coarser, dense and coalescent toward the 

 orbital carinte, which are fine but distinct, the epistoma ogivally 

 rounded ; prothorax about a third wider than long ; the sides 

 moderately converging from the base, broadly and rather strongly 

 arcuate, becoming feebly sinuate near the basal and apical angles, the 

 former slightly acute, sharp and feebly everted, the latter acute, 

 slightly everted, prominent and with the tip only slightly blunt ; 

 surface feebly convex, spmewhat flattened medially toward apex, 

 where the anterior margin is just visibly elevated at each side of 

 the flattened area, the punctures not very coarse but strong, im- 

 pressed and moderately sparse medially, without trace of an im- 

 punctate line, becoming gradually decidedly coarse and close but 

 not dense laterally ; elytra elongate, nearly two-thirds longer than 

 wide, very gradually ogivally acute posteriorly, about three times 

 as long as the prothorax but barely a fifth wider, the sides arcuate, 

 strongly and abruptly rounded at the humeri to the thoracic 

 angles, the humeri somewhat exposed at base, the callus short but 

 large and rather prominent, the punctures fine but strong, rather 

 sparse, becoming but little larger and still well separated laterally, 

 the impressed lines wholly obsolete ; abdomen finely, rather 

 closely punctulate medially. Length 10. o mm. ; width 4. 15 mm. 

 Mexico (Guadalajara), — Rolle * aberrans n. sp. 



Form rather narrowly fusoid, convex, shining, black with very feeble 

 bronzy lustre, the tarsi piceous, the pubescence extremely short 

 and conspicuous ; head rather coarsely, densely punctured, the 

 antennte rather stout, the tenth joint nearly twice as wide as long ; 

 prothorax rather short, almost one-half wider than long, strongly 

 narrowed anteriorly, the apex about two-thirds as wide as the base, 

 the sides evenly and notably arcuate, the basal angles very acute 

 and minutely prominent, the apical acute and anteriorly prominent, 

 the surface with a small and obsolescent impression on the basal 

 lobe, strongly and much less finely, somewhat sparsely punctate, 

 becoming gradually densely but not much more coarsely so later- 

 ally, with traces of an impunctate line anteriorly ; scutellum trans- 

 verse, broadly ogival, anteriorly declivous ; elytra oval, much more 

 obtusely ogival apically, the sides arcuate and the humeri broadly 



