COLEOPTEKA— STAPHYLINID^. 503 



however, a little smaller, the thorax tapers less rapidly, and the elytra are 

 not striate. The head is badly preserved, being crowded under the thorax ; 

 it appears, however, to be very small, about half as broad as the thorax, 

 with a broadly rounded front, large eyes, and a dark color. The thorax is 

 about two and a half times broader than long, with slightly convex sides, 

 regularly tapering toward the apex, but not so rapidly as would seem to be 

 required for so proportionally narrow a head ; the front border broadly 

 concave, the hind border very obtusely angulate, scarcely produced as a 

 broad triangle in the middle ; the surface is of a light color, very minutely 

 and profusely punctulate, the hind borders faintly marginate, the margin 

 black and punctate. The elytra are more elongate than, and do not taper 

 so rapidly as, in M. sanguinipennis ; they are of the color of the thorax, 

 even more delicately punctulate than it, with two small, short, black, longi- 

 tudinal, impressed dashes just outside the middle, and just before the end 

 of the basal third ; the basal edge of the elytra is marked in black, much as 

 the posterior border of the pronotum ; and the scutellum is small, owing 

 to the encroachment of the median prolongation of the prothorax. 



Total length, 3.5""° ; length of thorax, 0.6°"» ; of elytra, 2.5""° ; breadth 

 of head, 0.75"'" ; of thorax in front, 1.2°*"; behind, 1.45""; of elytra at the 

 spots, 2.1"". 



Green River, Wyoming. One specimen, Nos. 3990 and 4015. 



Family STAPHYLINID^E Leach. 

 OXYTELUS Gravenhorst. 



OXYTELUS PKISTINUS. 



PI. 5, Figs. 118-120. 

 Oxyteluspiistinus Scudd., Bull. U. S. Geol. Geogr. Surv. Terr., II, *9 (1876). 



A single faii'ly preserved specimen, but of which none of the append- 

 ages excepting the elytra are visible. Apart from the labral prolongation, 

 which is as in other species of Oxytelus, the head is subquadrate, slightly 

 broader than long, the eyes occupying the whole lateral outline and but 

 little convex ; the sutural divisions of the under surface show through upon 

 the upper surface (which is exposed to view), obscuring somewhat the parts 

 above. The prothorax is somewhat injured, but was evidently subquadrate, 

 a little broader than the head, nearly a third broader than long, the front 



