22 GEO. H. HORN, M. D. 



fovese rather large, deep and well separated, lateral grooves deep. Elytra very 

 little wider at base than the thorax, disc slightly depressed along the suture at 

 base, striae distinctly impressed, the punctures fine and close, intervals wider, 

 slightly convex and transversely wrinkled. Length .06 — .08 inch. ; 1.5 — 2 mm. 

 PI. ii, fig. 6. 



This species varies a little in the punctuation of the thorax ; in 

 some specimens it might be called rather sparse, while in most of 

 them it is close, but not dense. It most closely resembles puncticollis, 

 but the separate discal foveae and the less dense punctuation will 

 distinguish them. 



Since the publication of the description by LeConte, the distribu- 

 tion of this species is found to be very wide. It extends from Los ' 

 Angeles, in California, to Arizona, and northward to Oregon, thence 

 eastward to Nevada, Utah, Colorado and Canada. 



O. uitidus Lee. — Oblong oval, piceous, surface distinctly seneous, elytra 

 paler, legs testaceous. Thorax fully twice as wide as long, very little narrowed 

 posteriorly near the hind angles; apical border slightly sinuate within the 

 angles, and with a narrow transparent border; sides arcuately divergent from 

 the front angles to middle then abruptly, deeply emarginate to base, the emar- 

 ginatiou with a broad transparent border which does not extend to front angles ; 

 disc moderately convex, sparsely punctate shining, median groove mo<lerately 

 deep, discal foveae deep and well separated, lateral impression deep, moderately 

 broad, arcuate. Elytra very little broader than the thorax, strise not impressed, 

 composed of large, closely placed punctures, which become gradually more dis- 

 tant beyond the middle and at apex more obsolete, intervals near base narrower 

 than the striae, slightly transversely wrinkled. Length .07 inch. ; 1.75 mm. 

 PI. ii, fig. 7. 



Among the species here referred to the section Trymochthebius, 

 this one may be known by the comparatively smooth thorax and by 

 the elytral sculpture. In fact no other species has the elytra so 

 nearly smooth at apex, excepting kevipennis, which differs in too 

 many other particulars to require comparison. 



Evidently very widely distributed. The type is from Eagle Har- 

 bor, Lake Superior. Dr. LeConte adds, as a synonym, /ossa^us from 

 Fort Yuma, while my specimen is from Oregon. 



O. cribricollis Lee. — Moderately robust, piceous, with brown bronze sur- 

 face lustre, sides of thorax and elytra paler, legs testaceous. Thorax twice as 

 wide as long, distinctly narrowed to base; apical margin feebly bisinuate and 

 with a very narrow transparent border; sides arcuate, and at basal third moder- 

 ately deeply emarginate, the notch filled with transparent membrane, which 

 extends a short distance along the base, but not to the apex ; disc feebly convex, 

 with coarse, deep, closely placed punctures, the intervals shining, median line 

 rather finely impressed, discal foveee entirely absent, lateral impression broad, 



