LECONTE— SYNOPSIS OF PTEROSTICHUS. 245 



Lake Superior and Maine; abundant. Although Dejean described Feronia 

 Luczotii as apterous, yet this species agrees so perfectly in other respects that I 

 am obliged to consider it the same. It is difficult to believe that species so closely 

 related as P. Luczotii and the neighboring species would differ in such a particular, if 

 it were a constant character, and I therefore conclude that Dejean's observations were 

 made on an imperfect individual. 



h. 



In these species the margin of the thorax is wider and more reflexed than in any 

 of the preceding ; it is a little narrowed behind ; the posterior angles are obtuse, 

 the basal impression is large and very deep, obsoletely bistriate, with a carina 

 adjacent to the angle ; the elytra are deeply striate and have normally but two dorsal 

 punctures both in the second stria, one before, the other behind the middle; 

 frequently specimens are found with three, or even four dorsal punctures, but a 

 practised eye at once distinguishes the normal from the accidental points. The 

 parapleura? are short, and punctured, the first joint of the abdomen is impressed ; the 

 exterior marginal tarsal groove is distinct. They are all apterous. 



35. P. coracinus, thorace quadrato, lateribus late rotundato, postice subangustato, angulis posticis 

 obtusis rotundatis, basi utrinque late profunde foveato et punctato, carina angulari distincta, elytris vix 

 latioribus bipunctatis, striis profundis impunctatis, interstitiis convexis. Long. -7. 



Lee. Agassiz' Lake Sup. 206. 



Feronia coracina Newman, Ent. Mag. 5, 386. 



Niagara and Mackinaw. The basal carina of the thorax is parallel with the 

 margin and is more elevated than in the following species ; the basal impression is 

 deep and scarcely striate. 



36. P. adiunctus, tborace quadrato, breviusculo, lateribus late rotundato, postice subangustato, basi 

 utrinque late profunde foveato et punctato, carina angulari distincta, elytris vix latioribus, bipunctatis, 

 striis profundis impunctatis, interstitiis convexis. Long. -6. 



Lake Superior. This species very closely resembles the last; the posterior angles 

 of the thorax are obtuse but scarcely rounded. The basal carina narrows the lateral 

 margin posteriorly, instead of being parallel with it as in P. coracinus ; the basal 

 impression is deep, rather rugous than punctured, and scarcely bistriate. Newman 

 has described several species with bipunctate elytra, but with the exception of his 

 Feronia coracina and lachrymosa I cannot recognise any of them. 



37. P. flebilis, elongatus, tborace capite paulo latiore, latitudine fere longiore, postice subangustato, 

 lateribus vix rotundatis, basi depresso, utrinque late foveato et punctato, carina brevi, obtusa, elytris vix 

 latioribus, bipunctatis, striis profundis impunctatis, interstitiis convexis. Long. *6. 



Lake Superior, one specimen. Also resembles the two preceding, but the thorax 

 is much narrower and less rounded on the sides ; the posterior angles are obtuse not 



62 



