REVISION OF ELEODIINI BLAISDELL. 145 



Forma ordinata. — Nevada (Las Vegas, April and May, W. Kiiaus). 



Niiinber of specimens studied, 16. 



Type in the Horn collection. 



Type-locality. — OAvens Valley. California. 



Salient type-characterH. — Thorax siibcjuadrate, feeblj^ narrowed be- 

 hind, sides moderately rounded, margin hardly evident; apex and 

 base truncate, angles not prominent. Elytra with the humeri indis- 

 tinct, surface faintly substriate with densely and irregularly placed 

 muricate punctures (Horn). 



Diagnostic characters. — The larger and most elongate species of 

 the subgenus. Thorax densely and very coarsely punctate; elytra 

 coarsely, muricately and asperately punctured laterally and on apex ; 

 toward the suture the punctures become quite simple. The hairs of 

 the pronotum and elj'tra are long, quite erect, and somewhat bris- 

 tling, the interstitial being much longer than the strial hairs. Sur- 

 face opaque, integuments fre(iuently incrusted with dirt. 



The above characters servo to separate it from Iiirsiifa, tlie latter 

 being smaller in size, more robust, less coarsely but more densely 

 punctate and shining, the elytral hairs are shorter, softer, and quite 

 equal in length. 



In longipilosa the anterior femora are dentate and the elytra cau- 

 date, in pilosa mutic and not caudate. 



In letcheri the thorax is not pubescent and not as strongly punc- 

 tured. 



In the ordinate form each elytral interval has a regular series of 

 subnuiricate tubercles, with small and irregularly placed punctures. 



Variations. — The largest examples before me are two females col- 

 lected in Oregon, and the smallest a male taken at Carson City, 

 Nevada. In several females and a few males the pronotal margin is 

 wholly absent and the discal surface passes arcuately into the flanks ; 

 in the greater number of specimens the margin is more or less evi- 

 dent, while in others it is distinct and beaded. 



Pronotal variations (Plate 11, figs. 27, 28, and 29) are noticeable in 

 the series at hand. Typically the sides are slightly narrowed be- 

 hind and moderately rounded. The males show the greatest amount 

 of narrowing, and in one example the sides are very broadly and 

 feebly sinuate, the basal angles being slightly prominent; in two 

 females the sides are distinctly angulate : in both sexes the sides are 

 frequently evenly rounded from apex to the base. 



The anterior tibial spurs, although subecjual in length and thick- 

 ness, appear to vary slightly so as to obscure the true structural rela- 

 tionship. At the most the clitference is slight. In males the anterior 

 spur may appear just the least bit the longer and thicker; the same 



59780— Bull. 63—09 10 



