52 MEMOIRS ON THE COLEOPTERA 



strongly rounded, strongly converging from about the middle and gradu- 

 ally strongly sinuate to the right and very sharp, subeverted and promi- 

 nent angles; margins very narrowly reflexed; transverse impressions feebly 

 punctate, the anterior feeble, the posterior rather strong, the lateral 

 impressions moderately deep and very near the angles; median line finely 

 striiform; elytra oval, rather long, three-fourths longer than wide, widest 

 at three-fifths, the sides broadly arcuate, the humeri broadly rounded; 

 striae rather fine but impressed, finely punctured, the intervals feebly 

 convex, nearly flat laterally, where the striae are feeble and unimpressed; 

 third stria with three to four strong setigerous punctures at the inner 

 side; legs long and very slender. Length 10.5-11.4 mm.; width 4.3-4.4 

 mm. California (Alameda and Humboldt Co.) and Oregon (Clackamas 

 Co.). 



Allied to eschscholtzi but much more elongate, with longer, more 

 cuneiform and less oblong-oval elytra, less transverse prothorax 

 and paler coloration, not black throughout the body as in that 

 species. 



Nebria oregona n. sp. Stout, moderately convex, shining, deep black 

 throughout the body, the legs piceous-black, the tarsi barely paler; 

 antennae moderately pale, testaceous, the basal joint alone blackish; 

 head smooth, with obsolete impressions, about three-fourths as wide as 

 the prothorax; antennae filiform, two-thirds (cf) to three-fifths ( 9 ) as 

 long as the body; prothorax a third (c?) to one-half ( 9 ) wider than long, 

 the sides moderately rounded, becoming oblique in about basal half and 

 straight to the slightly obtuse but very sharp basal angles; surface very 

 narrowly but deeply concave and reflexed at the sides; impressions nearly 

 as in the preceding but still less punctured and, on the disk just behind 

 the middle of the length and slightly nearer the sides than the median line, 

 there is a small rounded impression; elytra broad, much wider than the 

 prothorax, a little wider behind the middle than at base, scarcely more 

 than one-half longer than wide, the sides very evenly and moderately 

 arcuate from the rather broadly rounded but very distinct humeri to 

 the posterior rounding; striae rather strongly impressed, very feeble 

 laterally, finely punctured, the intervals, except laterally, distinctly 

 convex, the third with three or four setigerous foveae; legs slender, rather 

 long. Length 10.3-11.5 mm.; width 4.^-4.8 mm. Oregon (Clackamas 

 Co.). 



This species seems not to be allied closely to any other but may 

 be placed in the mannerheimi section of the group. 



Nebria arkansana n. sp. Much narrower than the two preceding, 

 more nearly as in sahlbergi but smaller and with less developed head and 

 prothorax, shining, black, the under surface frequently rufescent, the 

 legs piceo-rufous, the entire antennae testaceous; head small, unimpressed, 

 the antennae slender, three-fourths as long as the body; prothorax one- 

 half wider than long to a little less, formed as in sahlbergi, the sides 

 strongly converging and sinuate posteriorly to the right and very sharp 



