300 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



From gracilis the two species under consideration differ in the 

 caudate elytra of the males and in having the prothorax slightly 

 longer. 



The prothorax in tenuipes is indeed almost as in the typical gra- 

 cilis. The type of tcnuij)cs and vv'rl-hami were practically collected 

 in the same geographical region, the latter extending into New Mex- 

 ico (Wickham's specimen) ; gracilis occurs in the same area. 



My specimen of tenuipes was obtained from Mr. G. W. Dunn, who 

 collected it at ¥A Paso, Texas; it was probably one of the same lot 

 from which Colonel Casey obtained his type. 



General ohservations. — The following analytical remarks are 

 founded upon Professor Wickham's New Mexico specimen : 



Mentum moderate in size and triangular, with apex rounded ; sur- 

 face very feebly convex and quite coarsely punctate. 



The pro- and mesoternal characters are identical, as are also the 

 tarsal characters, with those of tenuipes. 



The abdominal and metasternal salients and abdominal segments 

 do not differ relatively from those of tenuipes. 



The metasternum laterally between the coxa? is about as long as the 

 width of a mesofemur at base. 



The femoral and tibial characters are the same as in tenuipes.^ ex- 

 cept that the protibise have the articular cavities widely open. The 

 metatibife are just noticeably arcuate in basal half and gradually 

 but distinctly dilated toward apex. 



ELEODES VENTRICOSA LeConte. 



EleodCH ventricosa LeConte, Proc. Acad. Nat. Sci. riiila., 1858, p. 186. — 

 Horn, Trans. Auier. Phil. Soc, XIV, 1870, p. 311. — Champion, lUol. 

 Centr. Amer., IV, Pt. 1, 1884, p. 78. 



Fusiform ovate, robust, elytra usually strongly inflated, smooth, 

 and more or less shining. 



Head twice as wide as long, more or less moderately convex, fre- 

 quently slightly and transversely impressed between the eyes, with 

 the vertex nu)re strongly convex, frontal suture distinct, fined j^, 

 sparsely, and irregularly punctate. Anfcnrur moderately long, at- 

 taining a slight distance beyond the prothoracic base, comparatively 

 slender, very feebly compressed, and slightly clavate; third joint 

 about equal to the next two combined, fourth a little longer than the 

 fifth, the latter to the seventh, inclusive, subequal in length, eighth 

 shorter and slightly subtriangular, ninth and tenth suborbicular, 

 eleventh ovate. 



Pronotum slightly transverse, widest at the middle, one-fourth to 

 one-third wider than long, narrowing moderately anteriorly, slightly 

 posteriorly; disc, quite evenly and moderately convex, finely and 

 sparsely punctate; apex slightly emarginate, finely and more or less 



