116 BULLETIN 6:3^ UNITED STATES NATIONAL MUSEUM. 



ANALYTICAL KEY TO SPECIES OF LITHELEODES. 



Integumeuts smooth and "not at all asperate: 



Anterior femora mutic in the sexes arcuatu. 



lutegnnients more or less asperate : 



Elytra with approximate rows of punctures, which are feebly mnricate 

 laterally and on the apex; anterior femora armed in the male; thorax 

 finely punctate. 



Elytra not sulcate cvtricaia. 



Elytra sulcate var. arisonensis. 



Elytra more or less distinctly tuberculate * gmnnlata. 



Elytra muricately punctate : 



Elytra pubescent Ictcheri. 



Elytra not pubescent var. vandykci. 



ELEODES ARCUATA Casey. 



Eleodcs arcnaia Casey, Contr. to the Descr. and Syst. Uol. of N. A., Pt. 1, 

 1S84, p. 47 ; Annals N. Y. Acad. Sci., V, Nov., 1890, p. 395. 



Oblong-ovate to ovate, robust ; shining, glabrous, intense black, 

 and very finel}' sculptured. 



Head tw ice as wide as long, broadly and evenly convex, frequently 

 slightly impressed laterally and along the frontal suture, the latter 

 more or less evident and bisinuate; finely and irregularly punctate, 

 punctures very sparse on the vertex, becoming coarser and slightly 

 denser laterally and on the epistoma, or dense throughout. Antenme 

 moderate, reaching to the prothoracic base, subequal in length in the 

 sexes, outer four joints scarcely compressed or dilated, third joint 

 ^qual to the next two combined, fourth to the seventh inclusive sub- 

 equal, eighth slightly shorter and about as wide as long, ninth and 

 tenth suborbicular, eleventh ovate. 



Pronotum subquadrate, widest at or just in advance of the middle, 

 one-eighth to one-fifth wider than long; disc moderateh' convex on 

 the dorsum, more strongly so and arcuately declivous laterally, very 

 sparsely and more or less minutely pimctulate; a'pex broadly emar- 

 ginate, and quite obsoletely margined; sides rather strongly and 

 nearh^ evenly arcuate, most strongly so just in advance of the middle, 

 very feeblj^ and minutely sinuate just in advance of the posterior 

 angles, frequently most strongly arcuate at the middle and very 

 feebly and more broadly, but briefly sinuate behind, marginal bead 

 fine; hase evenly rounded, equal to the length, one-third to one-fourth 

 wider than the apex, very finely or obsoletel}' margined ; apical angles 

 acute, basal obtuse, but not at all rounded. 



Profleura' more or less sparsely punctulate and irregularly, more 

 or less strongly rugulose. 



Elytra oval, Avidest at the middle, about one-third longer than wide; 

 hose slightly and evenly emarginate, adapted to the prothoracic 



