98 BULLETIN 6;^, UNITED STATES NATIONAL MUSEUM. 



Female. — Genital segment trapezoidal, valves rather distant and 

 convergent apieall3\ setose; superior pudendal membrane rather 

 widely exposed. 



Yalrula (Plate 3, fig. 17). — Dorsal plate oblong, feebly explanate 

 externally, moderately narrow ; surface plane, finely and sparsely 

 punctate, also setose in apical half, seta? fine and short ; borders 

 parallel, straight or feebh' sinuous; apical margin feebl}^ arcuate in 

 outer three-fifths on the external apical lobe, the latter slightly 

 defined from the internal lobe by a slight sinuation ; internal lobe 

 not prominent. Apical parts set with moderately long seta\ 



Appendage not visible from above, short mammilliform, not ex- 

 tending beyond the margins of the fossa, the latter rather large. 



Superior pudendal membrane longitudinally rugulose and reaching 

 to the internal lobe. 



Ventrolateral surface rather evenh^ convex, not protuberant, sur- 

 face lines quite straight when viewed longitudinally, not transversely 

 concave before the apex ; submarginal groove broad and shallow, 

 forming a lateral concavity that does not bend inward beneath the 

 apex ; surface finely and sparsely punctate and setose, seta? very 

 short. Internal margins of the valves contiguous in basal eighth: 

 fissure rather broadly fusiform, open apically, closed in basal half 

 by the inferior pudendal membrane. 



In the granulato-Tnuricata form the genital segment of the female 

 is more quadrate, valves quite parallel. The dorsal plate is explanate 

 externally in apical two-thirds. Otherwise as in the typical form. 



Forma typica. — Ilahitat. — Washington (Walla Walla; Yakima. C. 

 V. Piper) ; Oregon (George Horn, G. W. Dunn) ; California (north- 

 ern, George Horn) ; Idaho (Hn])bard and Schwarz). 



Forma granulato-muricata. — Xevada (Verdi, April, F. E. Blais- 

 dell; Carson City, July; Reno, H. F. Wickham) ; Utah (C. Y. Riley) ; 

 California (Lassen County). 



Forma tuberculo-muricata. — Colorado (C. Y. Riley; South Park, 

 elevation, S.000-10.000 feet, Bowditch; Buena Yista, WickhamV 

 List). 



Number of specimens studied, 105. 



Type in the LeConte collection. 



Type-locality.—'' AYeiuiss River to Fort Colville." 



Salient type-characters. — Opaque, liead and thorax densely punc- 

 tate. Thorax subquadrato, narroAved behind, sides rounded, base 

 truncate, posterior angles obtuse. P^lytra depressed on the dorsum, 

 obsoletely striate, sculptured with subacute granules that are more or 

 less thickly and irivgularly placed, i)unctate on each side of the 

 suture. Prosternum perpendicular behind (LeConte). 



Diagnostic characters. — Tlunieralis exhibits a remarkable develop- 

 ment in the anterior tibial spurs. In both sexes the anterior spur is 



