382 CASEY 



and straight, with the outer angle at apex minutely and acutely 

 subprominent and the mandibles are densely punctate, with the 

 apical part abruptly impunctate and polished. We appear to 

 have two or three distinct forms which may be described as fol- 

 lows : — 



Form elongate-oval, convex, shining, piceous to blackish, with a feeble 

 aeneous lustre, the legs concolorous, the antennas dark rufous, the 

 upper surface with rather long prostrate yellow hairs, evenly dis- 

 tributed but not dense ; head quadrate, transversely convex be- 

 tween the intra-ocular excavations, sparsely and rather coarsely 

 punctate, more finely and closely anteriorly and on the epistoma ; 

 prothorax but little over a fourth wider than long, the sides 

 straight and feebly converging from the subrectangular and slightly 

 blunt basal angles about to apical third, then more rounding to 

 the apex, the latter truncate and only slightly narrower than the 

 base, the punctures coarse and rather close-set laterally, gradually 

 small and sparse broadly in the middle, the basal lobe strongly 

 rounded ; scutellum ogival, nearly as long as wide ; elytra twice 

 as long as wide, four times as long as the prothorax, and, at the 

 middle, not quite twice as wide, the sides broadly arcuate, the 

 apex acute, the humeri widely exposed basally and broadly 

 rounded, the punctures slightly coarse and confusedly lineate in 

 very feebly impressed lines, the intervals minutely, sparsely and 

 confusedly punctate ; abdomen finely, closely punctulate and 

 pubescent, less shining. Length 13. 0-15.0 mm, ; width 5.0-5.75 

 mm.((^, 9)- Arizona (Baboquivari Mts.) ...submetallicus Lee. 



Form similar, shining, dark piceo-rufous with a very feeble coppery 

 lustre, the legs concolorous, similarly though still less closely 

 pubescent ; head nearly similar but more finely and sparsely punc- 

 tate ; prothorax relatively larger, nearly a third wider than long, 

 the sinuato-truncate apex but little narrower than the base, the 

 sides very feebly converging and just visibly, subevenly arcuate 

 from the evident basal angles to the rounded apical angles, slightly 

 more arcuate very near the latter, the surface very broadly and 

 feebly impressed before each of the strong basal sinuations, rather 

 finely, sparsely punctured laterally, extremely finely and remotely 

 so medially ; elytra more than twice as long as wide, four times 

 as long as the prothorax, and, at the middle, about three-fourths 

 wider, the sides broadly arcuate, the tip very gradually acute, the 

 humeri widely exposed at base and broadly rounded, with the 

 callus pronounced, very elongate and gradually disappearing pos- 

 teriorly, the punctures moderately coarse, closely and confusedly 

 aggregated in scarcely impressed striiform lines, the intervals 

 sparsely, confusedly and very minutely punctate. Length 14.5 

 mm.; width 5.5 mm. {(^). Arizona (Santa Catalina Mts.). 



humeralis n. sp. 



