348 CASEY 



base, shining, rounded behind ; elytra three-fifths longer than 

 wide, not quite three times as long as the prothorax and barely 

 wider, parallel, the sides rounding at base, the apex gradually 

 obtusely ogival, the punctures very fine, widely spaced in regular 

 unimpressed series, slightly larger toward the sides, the intervals 

 sparsely, excessively minutely, irregularly punctulate ; abdomen 

 feebly rugulose, finely, sparsely punctate. Female having a very 

 shallow rounded sinus at the tip of the last dorsal segment. 

 Length y.S mm. ; width 3.2S mm. Arizona (Tucson). 



alutaceus n. sp. 



Integuments densely opaque 9 



9 — Form elongate-oval, convex, colored as in alutaceus ; head similar 

 but rather more coarsely and closely punctate, the punctures sep- 

 arated by barely their own diameters; prothorax nearly similar 

 but less narrowed anteriorly, the apex about three-fourths as wide 

 as the base, the basal angles more obtuse and the surface near 

 them more narrowly but more abruptly explanate, the sides more 

 nearly straight than in either of the other species, rounding at base 

 and ajDex, the jounctures less minute, stronger and rather less 

 sparse, becoming still more abruptly coarse, much denser and 

 longitudinally confluent near the sides and also having a narrow 

 imjDunctate median line, not evident in alutace?is ; scutellum 

 slightly larger, about a sixth as wide as an elytral base ; elvtra 

 similar in form but much more evidently wider than the prothorax, 

 the serial punctures larger and deeper, becoming in fact rather 

 coarse toward the sides, the interstitial punctui"es similar ; abdo- 

 men similarly rugulose but more strongly punctulate medially. 

 Male having a small and strongly rounded, reflexed and ex- 

 tremely minutely, apically incised lobe at the apex of the last 

 dorsal segment; female not observed. Length 7.3 mm. ; width 

 3.25 mm. Arizona (southeastern parts near Camp Grant). 



subopacus Horn 



Form elongate-oval but stouter in form, deep black, the under surface 

 and legs dark rufous ; head finely but strongly, less closely punc- 

 tate, the punctures separated by two or three times their own 

 diameters but extremely dense on the epistoma, as in the preced- 

 ing, the sides rather more converging, evenly and strongly arcuate 

 in the male, more prominent laterally than in the female, the 

 apical margin distinctly sinuate ; prothorax nearly as in subopacus 

 but larger, less narrowed at apex than in alutaceus^ the surface 

 near the hind angles only extremely narrowly and obsolctely ex- 

 planate, the punctures fine but strong, sparse, becoming in sim- 

 ilar manner abruptly coarse, dense and more or less confluent near 

 the sides, an impunctate median line not apparent; scutellum 

 well developed as in subopacus ; elytra nearly similar, shorter in 

 the female than in the male but only just visibly wider than the 

 prothorax in cither sex, the serial punctures only moderately 

 small, deep and very distinct, becoming ralher coarse laterally, 



