74 MEMOIRS ON THE COLEOPTERA 



the basal impressions small, basal and feeble; sides with short erect 

 setae, of which there is a sparse discal cluster near the hind angles; 

 elytra oblong-oval, with rather distinct though rounded humeri, 

 barely a third longer than wide, two-fifths wider than the prothorax, 

 very narrowly reflexed at the sides, the tegulae on the flanks becoming 

 acutely asperate, especially so on the entire posterior slope. Length 

 ( 9 ) 16.0 mm., width 7.8 mm. Nevada (banks of the Truckee River 

 at Reno). Taken by the writer monticola Csy. 



Form more ventricose, with smaller prothorax, rather convex and shining, 

 deep black; head nearly similar but less smooth, having some coarse 

 anastomosing creases in addition to the fine remote punctures 

 throughout; mandibles strongly arcuate, densely and strongly stri- 

 gose, much produced inwardly and very acute at tip; prothorax 

 shorter, fully three-fourths wider than long, the outline, angles and 

 form of the surface nearly similar but with the sculpture throughout 

 coarser and very coarsely and vermicularly rugose broadly toward 

 base, differing greatly in having numerous very long slender erect 

 setae along the sides throughout the length, more linear in arrange- 

 ment basally and not so clustered on the disk; elytra nearly two- 

 fifths longer than wide, evenly oval, without humeri, the tegulae 

 on the flanks not differing materially from those on the upper part 

 of the disk, except on the posterior slope, where they are close and 

 tuberculiform, shining but not asperate as in the preceding. Length 

 (9) 16.0 mm.; width 7.9 mm. Nevada (near Reno), Wickham. 



nevadensis n. sp. 



10 Body very convex and strongly ventricose, polished, deep black; 

 head two-thirds as wide as the prothorax, very finely, sparsely 

 punctate and with some deep anastomosing creases, the seta near 

 the eyes single as in the preceding; labrum scarcely impressed or 

 medially emarginate though punctate and setose transversely as 

 usual; mandibles arcuate, densely, strongly and finely strigose, 

 curved inward and acute at tip; antennae moderate, the pubescent 

 lateral areas meeting apically on the flattened sides of the distal 

 joints; prothorax two-thirds wider than long, the sides broadly 

 rounded, converging and becoming straight basally, the angles 

 narrowly rounded, distinctly produced; surface evenly, rather 

 strongly convex from side to side, narrowly but strongly reflexed 

 at the sides, still more strongly basally, finely, sparsely punctate 

 and with small but deep anastomosing creases, more coarsely but 

 sparsely punctured apically and basally, and, laterally, more densely 

 as well as coarsely, the basal impressions very feeble, apparently 

 having but a single marginal seta near the middle; elytra oval, very 

 convex, without distinct humeri, not a third longer than wide, very 

 peculiarly sculptured, as though the transverse lines of the typical 

 form of sculpture were abbreviated, the tegulae very short, isolated, 

 not definite though becoming broadly prominent at their hind 

 margins, with all longitudinal impressed lines obsolete; the short, 

 transversely asperate lines become much confused and sharply 

 elevated posteriorly and on the flanks; side margins more broadly 

 deplanate than in the preceding forms, the edge strongly serrulate 



