NATURAL SCIENCES OF PHILADELPHIA. 319 



I take to be the true species. The other, received from Mr. Motschulsky, ha! 

 the thorax broader, more rounded on the sides, with the posterior angles very 

 prominent, precisely as in N. m e t a 1 1 i c a ; the striae of the elytra are scarcely 

 less deep at the tip than at the base ; this specimen agrees perfectly with 

 those of N. m o e s t a, found by me on the north shore of Lake Superior. I 

 have also a specimen from Oregon, and several were collected by Mr. Barnston 

 at Carlton House, Saskatchewan River. 



Platynus corvus, niger, nitidus, thorace latitudine breviore, lateribus 

 cum basi rotundatis, margine laterali anguste reflexo, postice paulo latiore, 

 foveis basalibus latis baud profundis, tuberculo valde obsoleto notatis, elytris 

 oblongis thorace latioribus, planiusculis, basi emarginatis, striis profundis 

 impunctatis, interstitiis paulo convexis, 3io tripunctato. Long. -39. 



Black Hills, Dr. Hammond ; Saskatchewan. By the form of the thorax this 

 species exactly resembles P. atratus Lee, except that it is a little broader. 

 The elytra are, however, broader, less convex, and more emarginate at the 

 base. The size is one half larger. 



Platynus crassicollis, elongatus, nigro-reneus virescens, thorace ro- 

 tundato, margine anguste reflexo, foveis basalibus punctulatis, postice trans- 

 versim impresso, elytris thorace haud latioribus, striis profundis impunctatis. 

 interstitiis parum convexis, 3io punctis 4 vel 5 impressis. Long. "32. 



Jasper House, Rocky Mountains, Mr. A. Murray. Of the same form as P. 

 protr actus Lee , but smaller, with the thorax more convex, punctured 

 behind, and transversely impressed, and with the stria? of the elytra deeper. 



Platynus picicornis, ameo-niger, nitidus, thorace ovali, latitudine 

 paulo longiore, margine tenui reflexo postice vix latiore, foveis basalibus latis, 

 angulis posticis valde rotundatis, elytris basi emarginatis, oblongis, striis im- 

 punctatis, interstitiis parum convexis, 3io t5-punctato. antennis palpisque 

 piceis, pedibus piceo-testaceis. Long. -24. 



Jasper House. Related to P. retractus Lee, but is much smaller, and 

 differs from that and all the others of that division by the characters given 

 above. 



Pterostichus validus Maim. Jasper House ; precisely similar to speci- 

 mens from Sitka. 



Pterostichus protractus, angustus, thorace latitudine fere longiore pos - 

 tiee angustato, margine distincto reflexo, lateribus late rotundatis, postice sub- 

 sinuatis, basi recte truncato, linea marginali profunda medio interrupta, 

 utrinque bistriato, stria externa brevissima, elytris thorace vix latioribus 

 planiusculis fortiter striatis, humeris denticulatis. Long. *52. 



Jasper House. Resembles by its form P. contractus Lee, but belongs 

 to a different group having the base of the thorax margined, with the margi- 

 nal line interrupted at the middle, as in P. validus, californicus, algidus, &c, 

 than which this species is much more slender, with the thorax more narrowed 

 behind. 



Amara f a r c t a Lee. Saskatchewan. 



Harpalus amp utatus Say. Saskatchewan, Mr. Barnston. 



Harpalus ca r b o na t u s, elongato-oblongus, capite obtuso, oculis modice 

 prominulis, thorace capite latiore, latitudine breviore, postice subangustato, 

 lateribus late rotundatis, postice obsolete explanatis, angulis posticis rectis, 

 apice rotundatis, foveis basalibus parvis haud profundis parce punctatis ; 

 elytris (feminse) opacis, apice haud sinuatis, striis impunctatis, interstitiis 

 parum convexis, antennis palpisque piceo-rufis. Long. -40. 



Saskatchewan. Similar in form toH. advena Lee, but the thorax has 

 the posterior angles less rounded. 



I860."! 



j 



