388 PROCEEDINGS OF THE NATIONAL MUSEUM vol.88 



strongly constricted in front of middle, with a transverse impression 

 just behind the anterior margin, which is broadly rounded, slightly 

 sinuate in median line; disk finely and densely punctate-granulate; 

 with two small groups (2-4) of small, slender asperities at each side, 

 one group just behind transverse impression, and behind this another 

 group (usuall}^ only 2) of smaller ones; entire surface densely clothed 

 with small recumbent scales, those at sides and on posterior third of 

 disk light cinereous with a few brown ones intermixed, those on 

 anterior median disk brown; a dense fringe of erect, brown scales (or 

 short (spatulate setae) on the anterior margin. 



Elytra 1.29 times as long as wide, very slightly wider than pro- 

 notum; sides straight and subparallel on basal two-thirds, semi- 

 circularly rounded behind; basal margins very strongly elevated in 

 scutellar region, becoming lower laterally and lacking lateral to 

 fifth interspace, with 5 coarse, high serrations each side of suture; 

 first and second striae moderately, the others more weakly impressed, 

 punctures small, separated by less than their own diameters; inter- 

 spaces feebly convex, rugose, very finely punctured, each with a 

 median row of slightly coarser punctures, often accompanied by small 

 granules, surface masked by numerous small recumbent scales, most 

 of them brown, but nearly all those in first interspace and a few in 

 other interspaces light cinereous, nearly white ; with a single median 

 row of erect, spatulate setae, usually brown, in each interspace ; each 

 elytron with a dense group of erect, brown setae just behind the 

 crenate anterior margin. Declivity moderately sloping, with first 

 and second interspaces broad and nearly flat, slightly depressed 

 below level of third interspaces, which bears a few feeble granules. 



Ventral surface piceous-brown, sparsely clothed with divided scales, 

 which are cinereous except on last three abdominal segments, where 

 they are light brown, longer, erect, and for the most part entire, 

 but some bifurcate. Foretibia narrow at base, dilated distally, 

 with eight moderately slender teeth on outer margin. 



Female. — Similar to male but with frontal concavity shallower, 

 frontal hairs shorter, antennal club slightly broader (fig. 17, g) ; 

 pronotal asperities more strongly developed; pubescence on last 

 abdominal sternite erect, not modified in median line. 



Remarks. — The foregoing description of the male was prepared 

 almost entirely from the type, which was collected near Reno, Nev. 

 For a number of details, however, recourse was had to other speci- 

 mens because of the obscuring of certain structures of the type by 

 dirt. All measurements were made from the type except those of 

 the antennae. For these dissections of other specimens mounted in bal- 

 sam were used, it being impossible to make accurate measurements of 

 such small structures on entire specimens. 



