EEVISION OF ELEODITNI BLAISDELL. 103 



nearly straight to the apex, distinctly sinuate before the base; disc 

 rather coarsely, deeply punctate, densely so at the sides, with large 

 impunctate patches toward the middle. Elytra with disc rather 

 coarsely, feebly, and subasperately punctate, punctures rather sparse, 

 not much denser laterally, confusedly disposed (Casey). 



Diagnostic characters. — The structure of the anterior tibial spurs 

 allies this species with humeralis alone. The two specimens before 

 me are smaller and shorter ovate, the punctation is sparser and much 

 less asperate. The female resembles a large cordata in outline. 



I am indebted to Colonel Casey for the authentic male in my col- 

 lection. 



I have before me a small series of specimens collected at Soda 

 Springs, Idaho, which I refer to the present species until a larger 

 series shall have been studied. One of the specimens, a male, is more 

 strongly convex than the male received from Colonel Casey, while 

 the females have the facies of a moderately smooth cordata^ and the 

 punctuation is slightly coarser, the integuments duller and slightly 

 more asperate. One male from Idaho has the anterior spur of the 

 anterior tibiae much longer and stouter than in that sex of rileyi; in 

 a single female from the same region the anterior spur is unusually 

 prolonged and attenuated, being about four or five times longer than 

 the posterior, which is very short and unusually slender, in the other 

 females the anterior spurs are at least three times longer than the 

 posterior, much broadened and obtusely rounded at tip; these are 

 undoubtedly worn, and those in the female mentioned above with 

 unusually prolonged spurs represent the normal condition. I believe 

 that a sufficiently large series of rileyi would show what relation exists 

 between these forms ; they can be geographical races of either humer- 

 alis or rileyi. The genital characters are the same as in rileyi. 



In the authentic male of rileyi the mentum is moderate and sub- 

 triangular in outline, the surface not coarsely punctate, feebly convex, 

 and scarcely foveate laterall}^ 



The prosternum is not at all produced and vertically truncate be- 

 hind. The mesosternum is obliquely arcuate and very feebly and 

 broadly concave. 



The intercoxal process of the abdomen is evidently slightly trans- 

 verse and about a third of its width wider than the metasternal 

 salient. 



The metasternum laterally between the coxae is as long as the width 

 of a mesotibia at basal third. 



Post-coxal part of the first abdominal segment is equal in length 

 to that of the process, and also equal to the third segment in length ; 

 the second is about one-half longer than the fourth. 



The pro femora are clavate ; the grooves have distinct margins that 

 are asperulate and become contiguous at basal third. 



