244 LECONTE— SYNOPSIS OF PTEROSTICHUS. 



Middle States and Lake Superior ; common. The thorax less rounded and not 

 sinuate on the sides, at once distinguishes this from the preceding ; the abdomen of 

 the male is simple. I can scarcely understand how this species has remained 

 undescribed so long. 



32. P. corvinus, tkorace breviusculo, postice angustato, lateribus rotundatis non sinuatis, angulis 

 posticis subobtusis, impressionibus basalibus parce punctatis, elytris striis profundis, vix punctulatis. 

 Long. -58. 



Lee. Agassiz' Lake Superior, 207. 



Feronia (Omaseus) corvina Dej. Sp. Gen. 3, 281. 



Georgia, New York and Lake Superior. One specimen from the last place has 

 the thorax covered with very deep transverse wrinkles, but- does not otherwise differ. 

 The last ventral segment of the male is simple. 



These are oblong flattened species, very similar to those in (e.), but having usually 

 a wider margin to the thorax, and five large foveas on the elytra ; the epipleurse are 

 moderately long, the first joint of the abdomen not impressed ; the outer tarsal groove 

 is deep. The thorax is narrowed behind, not sinuate, or scarcely sinuate on the sides, 

 the basal impressions are punctured and single. The native species are winged, and 

 correspond to Chaudoir's Bothriopterus. 



33. P. orinomuru, piceo-niger, subaeneus nitidus, thorace latitudine siibbreviore, postice subangustato, 

 lateribus sequaliter marginatis, basi truncato utrinque striato et punctato, elytris 5-foveolatis, striis 

 punctulatis. Long. -45. 

 Lee. Agassiz' Lake Superior, 206. 



Omaseus orinomum Curtis; teste Kirby, Fauna Bor. Am. 4, 32. 



Abundant at Lake Superior ; also in Oregon. The specimen from the latter 

 locality was compared by Klug and considered identical with European specimens. 

 As however the P. adstrictus is found at Sitkha, there is some probability that our 

 species may in reality be the same with it : the only point of difference seems to be 

 in the color ; which in ours is not pure black, but piceous with a very slight bronzed 

 tint. I hope soon to have specimens from Russian America to determine this point. 

 Dr. Zimmerman, considering ours as distinct from the P. orinomum, has proposed for 

 it the name of P. septentrionalis. 



34. P. Luczotii, piceo-niger, vix asnoscens, thorace latitudine breviore, postice subangustato, lateribus 

 marginatis, margine postice paulo latiore, basi subrotundato, utrinque striato et punctato, elytris sub- 

 opacis 5-foveolatis, tenuiter striatis, interstitiis fere planis. Long. -4— -5. 



Lee. Agassiz' Lake Sup. 206. 



Feronia LiiczotiiDej. Sp. Gen. 3, 321. B 



Feronia oblongonotata Say, Tr. Am. Phil. Soc. 4, 425. 



Adelosia oblongonotata Lee. An. Lye. 4, 335. 



