452 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



DYTISCIDJE. 



7. Hydeoporus congruus, n. sp. 



Broadly ovate, more pointed behind, not convex, black: head, an- 

 tennae, legs, and elytra testaceous, the latter with the suture, part of 

 side-margin, and several discoidal stripes black; the latter are con- 

 fluent in places. Prothorax piceous; sides oblique, nearly straight, 

 forming an obtuse angle with the elytra; sides extremely finely mar- 

 gined; disc smooth, slightly rugose towards the hind angles, feebly 

 depressed near the base ; marked each side with a curved line extending 

 from the base to beyond the middle. Length 2.5™°^ (0.10 inch). 



Florissant, Colo., (8,000 feet) ; one specimen. Seems to be related to 

 the European H. assimilis. 



8. Gaurodytes nanus, n. sp, 



Elongate-oval, more narrowed behind, black, antennae, palpi, and 

 legs rufo-testaceous ; elytra brown towards the sides, reticulate in rather 

 large meshes by fine lines, with scattered accessory punctures behind 

 the middle. Head with two red occipital spots. Prothorax reticulate 

 like the elytra, brown towards the sides, which are narrowly margined 

 and slightly curved near the front angles. Hind tibise without punctures 

 at the inner margin. Length 6.5™°^ (0.25 inch). 



Florissant, Colo., (8,000 feet) ; one $. Allied to G. striguJosus Crotch, 

 but narrower and more convex, and without even a short row of punc- 

 tures at the inner edge of the hind tibiae. Tarsi moderately dilated ; 

 claws small, the front ones not toothed. 



STAPHYLINID^. 



9. Geodromicus ovipennis, n. sp. 



Black, shining, sparsely and finely pubescent. Head deeply impressed 

 as usual, sparsely punctured. Prothorax ovate, convex, a little wider 

 than long ; sides oblique behind, feebly sinuate ; hind angles rectangular, 

 slightly depressed ; base marked with a transverse fovea at the middle ; 

 surface not densely punctured ; dorsal channel feebly impressed. Elytra 

 at base not wider than the widest part of the prothorax, much wider 

 behind, with the sides oblique; convex, rather densely punctured. 

 Abdomen finely punctulate. Palpi and tarsi piceous. Length 4.3™'" 

 (0.17 inch). 



Leavenworth Valley, above Georgetown, Colo., (9,000 to 10,000 feet); 

 July ; one specimen. Eesembles black specimens of G. verticalis, but the 

 prothorax is narrower, more convex, and less punctured, and the elytra 

 are much narrower at the base. It seems to correspond with the race 

 G. plaglatus of Europe (Fauvel, Faune Gallo-Ehenane, 108). It is, how- 

 ever, so different from our two other species that I must regard it as 

 different from them. 



