REVISION OF ELEODIINI BLATSDELL. 405 



fine seta? on the internal surface; fossa small, located at base of the 

 external surface. 



Appendage short niamniilliforni. smooth, with a pencil of some 

 four short setae at tip. 



Basal prommences not in the least evident. 



Saperior pudendal membrane rather long, quite attaining the 

 apical margin of the dorsal plate, longitudinally rugulose. 



Ventrolat<'i'(d surfaces. — Body surface lines nearly straight when 

 view^ed longitudinally, slightly swollen in basal half, smooth, feebly 

 setose apically; submarginal groove nearly obsolete, external margin 

 of the dorsal plate being scarcely at all prominent laterally. Internal 

 margins of the valves contiguous in basal two-thirds; fissure in 

 apical third and closed. 



Habitat. — Arizona (Tucson and Pinal mountains, Wickham ; Pres- 

 cott) ; Nevada (Pioche) ; California (Palm Springs, March), 



Number of specimens studied, 12. 



Type male in my collection; female (Cat. No. 12233) U. S. National 

 Museum collection. 



Type-localities. — Male, Tucson, Arizona ; female. Palm Springs, 

 California. 



Salient ty pe-characters. — Both sexes elongate and subcylindrical. 

 Antennae long. Head finely punctulate. Thorax small, a little wader 

 than long; disc more or less obsoletely punctulate, rather strongly 

 convex ; apex feebly emarginate ; sides moderately arcuate, narrowing 

 posteriorly, marginal bead fine; base ver}^ feebly rounded; apical 

 angles obtuse, distinct, not rounded nor prominent ; basal angles 

 obtuse, not rounded. Elytra at base more or less adapted to the pro- 

 thoracic base, which it scarcely exceeds in width ; humeri obtuse, 

 angle distinct and small ; disc more or less moderateh^ convex, striato- 

 punctate, strial punctures closely placed and rather small, stria? mod- 

 erately distant, interstitial punctules fine, slightly irregular and 

 rather distantly spaced in a series, scarcely different laterally. 

 vSterna and abdomen with distinct and sparse hairs; legs slender. 

 Hairs and spinules ferruginous. 



Diagnostic characters. — The most slender and subcylindrical species 

 of the subgenus. 



Easily recognized by its smooth, opaque, and alutaceous integu- 

 ments, the antenna^ are long and the legs slender, the ventral surface 

 is sparsely clothed with erect and rather long hairs. All hairs and 

 spinules are ferruginous in color. 



The females are dimorphic. The type is of the same form as the 

 male, wdiile others are ovate and depressed like that sex in dissimilis. 



If it were not for this fact, I would consider nevadensis as very 

 distinct; but as it is, there is difficulty at times in separating the 

 females of the two races. 



