456 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



IJunctiired and clothed Avith quite long setio. Sinus triangular, two- 

 thirds closed by membrane, the latter setose. 



Hahitat. — Nevada (Horn; Hubbard and Schwarz) ; California 

 (Lassen County, Charles Fuchs). 



Number of specimens studied, 2 (males). 



Type in the Horn collection ; collected by Mr. William M. Gabb. 



Type-locality. — Western Nevada. 



Salient type-characters. — The most elongate of our species. Pro- 

 thoracic margin acute, moderately explanate and reflexed. Elytra 

 with margin simply acute and extending to apex. Epipleunie indis- 

 tinctly defined except at apex. 



Diagnostic characters. — The elongate form, with elytra gradually 

 and arcuately narrowing to apex give a characteristic facies. 



Separated from contusum by its narrower form, besides the 

 body has a greater dorso-ventral thickness, and the males are not 

 caudate. In planum the elytral margins do not reach the apex, in 

 elongatum they do. From depressum by its elongate oval elytra, 

 obsoletely defined epipleura? and by having the basal joints of the 

 antennae less pubescent. 



General ohservations. — The nientum is rather small, middle lobe 

 variable, sides converging anteriorly, straight or more or less arcuate, 

 with apex rounded or subacute; surface very slightlv convex and more 

 or less feebly foveate laterally. 



The prosternum is arcuately prominent ventrally with the coxa*, 

 feebly compressed and sometimes subvertically truncate posteriorly. 



Mesosternnm arcuately declivous and rather deeply concave. 



The abdominal intercoxal salient is small and quite quadrate, one- 

 half of its width shorter than the post-coxal portion of the same seg- 

 ment, the latter subequal in length to the second; third segment a 

 little shorter than the second; the fourth is one-half the length of the 

 second. 



The abdominal and metacoxal salients are quite equal in Avidth. 



The metasternum laterally between the coxjt is short and equal in 

 length to the width of a mesotibia at middle. 



The tibial grooves of the femora are well developed, more or less 

 concave externally, becoming flat internally, glabrous and impunc- 

 tate; margins distinct, more or less acute and gradually converging 

 to the femoral base. 



The 2^1'otibia; are distinctly compressed, and carinate externally; 

 carina quite entire, surface longitudinally grooved behind the same, 

 groove as})erately sculptured. 



Meso- and metatibiic subcylindrical in section, flattened or grooved 

 externally, grooves opaque, glabrous and moi'e or less punctate. 



The tarsi are moderate in length and stoutness. 



