450 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



not wider behind, basal angles rectangular, but not i^rominent, and 

 slightly rounded at tipj disc flat, dorsal line fine, basal impressions 

 small. Elytra elongate-oval, flat, finely striate, narrowly margined, ob- 

 liquely sinuate towards the tips, which are divergent and separately 

 rounded ( 5 ), or nearly acute {S). Length lO-S-lS-S"^"^ (0.42-0.52 inch). 



Mountains of California, Oregon, ISTevada, and Idaho. Very similar to 

 P. dissectus, but the surface is not shining ; the side-margin of the pro- 

 thorax is not wider towards the base, and the basal angles are less ele- 

 vated. The elytra are less strongly margined, and more finely striate. 

 The species of Platynus which constitute the subgenus Ehadine may be 

 separated as follows : — 



The form is very slender ; front tarsi without grooves ; middle and 

 hind tarsi with lateral grooves. Hind angles of prothorax well defined. 

 Elytra elongate-oval, flat, strongly margined, obliquely sinuate towards 

 the tips, which are divergent. Color brown or blackish j antennse and 

 legs paler. 



Third joint of antennae much longer than the fourth 2. 



Third joint of antennae but little longer than the fourth 3. 



2. Apical angles of elytra less acute larvaUs. 



Apical angles very long, divergent caiidatus. 



3. Shining ... dissectus. 



Subopake jejunus. 



3. Amaea (Cuetonotus) cylindrica, n. sp. 



One i from South Park, Colorado, (8,000 to 10,000 feet), agrees with 

 a specimen from Slave Lake, and is very near to others from Lake Win- 

 nipeg. It is allied to A. lacustris Lee, but the elytra are more convex 

 and narrower, and the color is darker, with a distinct metallic gloss. 

 The sides of the prothorax are rounded almost to the base, the sinuosity 

 is very short, but the hind angles are equally prominent. The meta- 

 thoracic side pieces are marked with a stria each side, and scarcely 

 I)unctured. The 1st and 2d ventral segments are feebly punctured,^ 

 and there are a few scattered punctures at the side of the metasternum. 

 The legs are dark brown ; the upper tooth of the inner side of the 

 middle tibise is acute and prominent, the lower one is very small. 

 Length lO-""^ (0.40 inch). 



4. Harp ALUS clandestinus, n. sp. 



Elongate, oblong-oval, piceousbrown, anteniige, palpi, and legs rufo- 

 testaceous. Prothorax wider than long, sides rounded in front, then 

 nearly straight, but very feebly sinuate to the hind angles, which are 

 rectangular, not at all rounded ; base emarginate, side-margin more 

 reflexed than usual, explanate and sparsely punctulate towards the base; 

 basal iiBi^ressions narrow, slightly punctured. Elytra not wider than 

 prothorax, striae deep, impunctured, interspaces slightly convex; dorsal 

 puncture upon 3d stria; outline oblique towards the tip, but not sin- 



