LECONTE— SYNOPSIS OF PTEROSTICHUS. 243 



28. P. mandibularis, elongatus, apterus, subcylindricus, thorace latitudine vix breviore postice 

 subangustato, lateribus magis rotundatis, postice breviter subsinuatis, basi utrinque striatoet punctulato, 

 elytris tripunetatis, striis punctulatis, pedibus rufis. Long. -25. 

 Lee. Agassiz' Lake Superior, 206. 

 Argutor mandibularis Kirby, Fauna Bor. Am. 4, 31. 



North side of Lake Superior; although closely related to the preceding species, 

 the parapleurge are much shorter, so that it might almost be placed in division (c.) ; 

 the parapleurge and sides of the abdomen have a few scattered punctures. Kirby 

 mentions only two dorsal punctures. In my specimens the three punctures are 

 visible except in one, where the posterior point is obliterated ; in one specimen the 

 left elytron has four points, one being placed between the second and the posterior 

 point. 



Oblong species with long parapleural ; the thorax is narrowed behind, with the 

 posterior angles sometimes obtuse, sometimes prominent. The basal impressions are 

 bistriate, with a small carina adjacent to the angle. The margin of the thorax is 

 narrow, although a little broader than in the last group ; the elytra have three dorsal 

 punctures; the scutellar stria is distinct; the pectus is more or less punctured; the 

 first segment of the abdomen has an impression; all are winged, and all have the 

 groove on the outer margin of the tarsi deep. 



29. P. acutangulus, nitidissimus, thorace postice angustato, lateribus rotundatis postice sinuatis, 

 angulis posticis prominulis, impressionibus basalibus vix rugosis, elytris vix latioribus, tripunetatis, 

 striis vix punc'ulatis, interstitiis subplanis. Long. -65. 

 Lijperus acutangulus Chaud. Bull. Mosc. 1843, 101. 



New York, Illinois, Louisiana ; the abdomen of the male has a round impression 

 on the last joint. 



-30. P. luctuosus, thorace postice angustato, lateribus rotundatis, postice breviter sinuatis, angulis 

 posticis prominulis, impressionibus has ilibus punctatis, elytris vix latioribus, tripunetatis, striis profundis 

 punctulatis. Ling. -41 — -5. 

 Feronia (Omaseus) luctuosa Dej. 3, 284. 

 Omase.us nigrita^Kirhj, Fauna Bor. Am. 4, 32. 

 < Stereocerus caudicalis^Lee, An'. Lye. 4, 336. 



New York, Lake Superior, and Missouri Territory. The reference to Feronia 

 caudicalis Say, is very doubtful, as the antennae do not at all agree; the last joint of 

 the abdomen of the male is scarcely impressed. I am somewhat doubtful whether 

 Dejean's name should belong to this or to the next species, which agrees better in 

 size; the present one is certainly much more related to P. anthracinus of Europe 

 with which Dejean compares his F. luctuosa. 



31. P. abjectus, thorace latitudine non breviore, postice subangustato, lateribus late rotundatis vix 

 sinuatis, angulis posticis subobtusis, impressionibus basalibus punctatis, elytris vix latioribus, tripunetatis, 

 striis profundis punctulatis. Long. -37. 



