2io MEMOIRS ON THE COLEOPTERA 



impression obsolete. Length (cf) 8.3-9.7, (9) 9-5 mm.: width 

 (cf) 1.9-2.3, (9 ) 2.7 mm. California (Lake Co.). . .tenellus n. sp. 



Male unknown. Female as in pacificus but shorter and relatively 

 stouter, the coloration, sculpture and vestiture nearly similar, the 

 antennae similar and with a much longer basal joint than in tenellus, 

 the third joint less elongate than in pacificus, piceo-rufous in color, 

 with the basal joint black, slender, two-thirds as long as the body; 

 prothorax much stouter and shorter than in either of the preceding, 

 barely as long as wide, more narrowed to the more arcuate apex, 

 nearly similar otherwise though with rather more sharply angulate 

 tubercles; elytra nearly as in pacificus, except that the sutural black 

 vitta fades out near the scutellum; abdomen as in pacificus, except 

 that the fifth segment is evenly rounded throughout at apex and 

 not broadly, obtusely angulate, and without trace of the two apical 

 archings of the surface; legs fusco-ferruginous, black distally; 

 last dorsal plate of the female broadly rounded at apex, becoming 

 rather deeply sinuate at the middle. Length (9) 13.8 mm.; 

 width 4.0 mm. California (Lake Co.) : hesperus n. sp. 



Male unknown. Female in form nearly as in the preceding but with 

 relatively much narrower head and prothorax, the former being less 

 developed than in any other species; eyes moderate, separated by 

 nearly three times their own width; antennae very slender, two-thirds 

 as long as the body, very pale flavo-testaceous in color throughout, 

 the basal joint scarcely visibly less pale, the fourth relatively shorter 

 than in the preceding; prothorax much narrower, longer than wide, 

 the pubescence short, rather coarse, golden, not dense; elytra nearly 

 as in hesperus but wholly pale in color, except a faint blackish streak 

 from the humeri fading out near basal fourth; abdomen pale, densely 

 punctulate, the bases and apices of the segments nubilously darker, 

 the fifth segment much shorter and with two small sinuses nearly 

 as in pacificus but smaller and more widely separated; last dorsal 

 segment very different, being more narrowly and very evenly rounded 

 at apex, without sinus. Length (9) 12.0 mm.; width 3.3 mm. 

 California (Lake Co.) parviceps n. sp. 



7 Elytral flanks shining, rather coarsely, sparsely punctate, with few 

 if any minute punctules; pubescence throughout rather incon- 

 spicuous 8 



Elytral flanks alutaceous as elsewhere, because of the very dense minute 

 punctulation, sometimes with a few slightly larger punctures 

 sparsely intermingled; general pubescence long, denser, more di- 

 versely laid and conspicuous; antennae differing sexually, being 

 much longer and heavier in the male as in lateralis 1 1 



8 Elytral vestiture even from the suture nearly to the limits of the more 

 shining and subglabrous flanks, composed of short, oblique, moder- 

 ately close and rather inconspicuous hairs nearly as in the four 

 preceding species; antennae not differing much sexually, resembling 

 the trivittatus and pacificus groups 9 



Elytra each with a narrow axial line near inner third, in which the hairs 

 become oppositely oblique as in a cow-lick; antennae differing 

 sexually, being much longer and heavier in the male 10 



