1854.] 57 



I. 



r A group of small black winged species, having the thorax transverse, rounded 

 at the sides and base, with the posterior angles very obtuse, but usually distinct ; 

 the margin is narrowly reflexed, especially towards the posterior angles; the 

 basal impressions are not obvious, being lost in the concavity between the mar- 

 gin and the disc ; the elytra are oblong, and flattened ; they are deeply emarginate 

 at base ; when the elytra have three small punctures, they are almost truncate 

 at tip, and are slightly sinuate: when I he elytra are deeply foveate, the sutural 

 portion is more prolonged, so that the truncation becomes oblique. The striae 

 are veiy fine and badly defined; the legs and antennae are black; the latter area 

 little stouter than usual, though hardly perceptibly so. 



57. P. c o n s i m i 1 i s, niger, nitidus, thorace subquadrato transverso, basi et 

 lateribus latins rotundato, angulis posticis distinctis, margine tenui reflexo pos- 

 tice paulo latiore, elytris oblongis, basi valde emarginatis, thorace duplo latiori- 

 bus, tenuiter striatis, subtiliter tripunctatis. Lon^. *32. 



One specimen ; Michipicoton, Lake Superior. Differs from P. obsoletus by its 

 larger size, less rounded base of thorax, and much more distinct posterior angles. 

 The four anterior trochanters are red. As in the next two species, the apex of 

 the elytra is almost truncate, and as in them the second puncture is in the second 

 stria. 



58. P. obsoletus, niger, nitidus, thorace transverso, postice subangustato 

 basi valde rotundato, angulis posticis obtussissitnus, margine tenui reflexo pos- 

 tice paulo latiore, elytris oblongis, basi valde emarginatis, thorace duplo latiori- 

 bus, tenuiter striatis, subtiliter tripunctatis. Long. *24 -28. 



Feronia obsoleta Say, Trans. Am. Phil. Soc. 2, 57. 



Agonum luctuosum Dej. Sp. Gen. 3, 172. 



Agonum obsoletum Say, Trans. Am. Phil. Soc. 4, 423. 



c F/ronia placida Say,'i Lee. Ann. Lye. 4, 227 ; Agassiz' Lake Superior, 205. 



New York and Lake Superior. The error by which I referred this species to' 

 Feronia placida Say, is entirely unaccountable. This common species frequently 

 has the anterior and middle trochanters of a deep red color. I have received a 

 typical specimen named by Say, through the kindness of Dr. Harris. 



59. P. strigicollis, niger, nitidus, thorace transverso, postice vix an- 

 gustato, basi rotundata, angulis posticis obtusis, margine tenui reflexo postice 

 paulo latiore, impressionibus basalibus longiusculis minus distinctis subtiliter 

 rugosis, elytris fere duplo latioribus oblongo-quadratis, subtiliter striatis, tri- 

 punctatis. Long. -3. 



Anchomenus strigicollis Mann. Bull. Mosc. 1852, 294. 



Oregon, at Prairie Paso, and Fort Vancouver, Dr. J. G. Cooper ; northern 

 part of the west coast of America, according to Count Mannerheim. This spe- 

 cies is very closely related to the preceding, but the thorax is wider posteriorly, 

 thus becoming more quadrate, the posterior angles are more distinct, and there- 

 flexed margin is a little wider. The elytra are comparatively much shorter, 

 being not more than one half longer than wide, while in P. obsoletus they are 

 fully twice as long as wide; the basal impressions of th thorax, though long, 

 are very indistinct; in the preceding they cannot be traced. 



60. P. bembidioides, aeneo-niger, opacus, thorace transverso subquad- 

 rato, basi rotundata, postice subangustato, angulis posticis obtusis at distinctis, 

 elytris oblongis, maculis sericeis confluenlibus variegatis, tenuiter striatis, foveis 

 quatuor magnis utrinque impressis. Long. -26. 



Lee. Agassiz' Lake Supetior, 206. 



Sericoda bembidioides Kirby, Fauna Bor. Am. 15, pi. 1, fig. 2. 



Agonum bembidioides Lee. Ann. Lye. 4, 227. 



One specimen, Lake Superior. Closely resembles the next species, but is 

 sufficiently distinct by its larger size, and the irregularly mottled appearance of 

 the elytra. 



Kirby's genus Sericoda was formed on an erroneous examination of the palpi 



