AMERICAN COMPONENTS OF THE TENTYRIIN^ 389 



not larger but closer and shallower laterally, confused and with 

 but the feeblest possible traces of disconnected series ; abdomen 

 polished, aeneous, finely but strongly, sparsely punctured, more 

 coarsely and closely so only very near the sides. Length 9.5-10.0 

 mm.; width 3.8-4.1 mm. Arizona, — Warren Knaus. 



symmetricum n. sp. 



Form shorter and stouter, oval, strongly convex, polished, piceous- 

 black with faint bronzy lustre, the pubescence extremely short, 

 sparse and inconspicuous ; head rather finely but strongly, closely 

 punctate, less densely medially, the supra-orbital carinte distinct, 

 the surface feebly impressed along them internally, the epistoma 

 angulate ; antennae nearly as in fusiforme; prothorax more trans- 

 verse than in the two preceding species, nearly a third wider than 

 long, the form nearly similar, the sides evenly and moderately 

 arcuate throughout, the basal angles right, the apical acute and 

 produced, the surface finely but strongly, sparsely punctured, 

 gradually becoming densely and notably coarsely so laterally but 

 finer at the edge than at some distance therefrom as in sy7n- 

 7netrictim ; scutellum similar, impunctate; elytra leather rapidly 

 and arcuately narrowed in apical third, the sides arcuate, the 

 humeri rounded and slightly exposed at base, with the callus un- 

 usually pronounced, the surface with rather distinctly impressed 

 lines suturally, the punctures very fine and sparse, becoming 

 much larger and closer but still well separated laterally, confused 

 though with rather obvious series of larger punctures, irregularly 

 single suturally but becoming wider aggregations laterally as in 

 gracile; abdomen rugosely punctured broadly toward the sides, 

 finely and rather sparsely medially. Length 9.3-10.0 mm. ; w'idth 

 4.2-4.7 mm. Arizona (southern), — F. H. Snow. 



pimalicum n. sp. 



Form still shorter, almost similarly stout, strongly convex, polished, 

 dark piceous-brown with faint aeneous lustre ; head rather coarsely 

 and densely punctate, more sparsely so at the centre of the vertex, 

 the epistomal lobe large, ogivally rounded ; prothorax ((5^) a fourth 

 wider than long, the sides evenly converging from the base, 

 broadly, subevenly arcuate, the apical angles somewhat acute, 

 but slightly prominent, the basal a little more than right, slightly 

 blunt, not everted, the surface evenly convex, rather finely, 

 sparsely punctate medially, gradually somewhat coarsely and 

 closely so laterally ; prothorax ( Q ) a little more transverse, 

 similar but with the punctures much more close-set throughout, 

 becoming only moderately separated medially; elytra rather 

 rapidly ogivally acute in apical third, much wider than the pro- 

 thorax and about three times as long, the humeri obliquely and 

 moderately rounded to the thoracic base, with the callus short but 

 pronounced, the surface with obsolete impressed lines suturally, 

 more evident in the female, the punctures rather fine and sparse 

 suturally, somewhat coarse and close-set but shallow and some- 



