432 Coleopterological Notices. 



densely, somewhat coarsely punctate ; upper lobes of eye moderate, separated 

 by about five times their width ; antennae moderate, gradually and feebly in- 

 crassate toward apex, the third joint much shorter than the next two. Pro- 

 thorax nearly four-fifths wider than long, the apex scarcely more than three- 

 fourths as wide as the base, the latter transverse, the sinuations strong ; basal 

 angles right and very distinctly, although narrowly, rounded ; sides evenly 

 and rather strongly arcuate ; disk widest at the base, finely and very densely 

 punctate throughout, the punctures not greatly coalescent. Elytra behind the 

 middle a very little wider than the prothorax, about two and one-half times 

 as long as the latter ; sides feebly arcuate, broadly, parabolically rounded 

 behind ; disk rather finely striate, the stria? somewhat abruptly and distinctly 

 impressed, the punctures moderately coarse, circular, deep, perforate and 

 generally very close, separated by scarcely their own widths ; intervals wide, 

 flat, fully seven times as wide as the strial punctures, very finely but not very 

 sparsely punctured. Abdomen shining, sparsely, somewhat finely punctate, 

 the pubescence rather long, fine, very sparse but distinct. Legs rather long 

 and slender. 



Male. — Unknown. 



Length 6.3 mm. ; width 3.0 mm. 



Mexico (Sonora). 



The unique specimen is a female but is quite distinct from any- 

 thing known to me, and apparently not described in the Biologia 

 Centrali-Americana. From the fact that the anterior tarsi of this 

 female are rather robust or subdilated, I am disposed to place it in 

 the section with strongly dilated male tarsi. It may be easily 

 known by its robust form — somewhat resembling dilatatus, — its 

 smooth but very dull surface, fine, dense pronotal punctuation, 

 evenly, closely punctured elytral stria?, very wide flat intervals and 

 the coarse short ochreous-yellow and abundant pubescence. 



11 B. castaneilS n. sp. — Elongate-oval, somewhat depressed, moderately 

 shining, dark blackish-brown ; legs dark rufo-piceous ; pubescence moderate 

 in length and density, rather fine, dark fulvo-piceous and not conspicuous. 

 Head densely deeply punctate, moderately convex ; epistoma very broadly, 

 rather feebly sinuate ; upper lobes of eye moderate or rather large, separated 

 by nearly five times their width ; antenna? rather slender toward base, gradu- 

 ally and moderately incrassate toward apex, the third joint very much shorter 

 than the next two, eighth nearly as large as the ninth. Prothorax not very 

 strongly transverse, about one-half wider than long, the apex much narrower 

 than the base, broadly rather strongly emarginate in circular arc ; base trans- 

 verse, the sinuations strong ; sides almost evenly and strongly arcuate ; basal 

 angles obtuse and generally very narrowly rounded ; disk very deeply, rather 

 coarsely and extremely densely punctate, the punctures strongly, longitudi- 

 nally coalescent, forming short rugae toward the sides, generally not noticeably 

 sparser in the middle. Scutellum moderate, the polished margin distinct. 



