48 [April, 



Louisiana; Dr. Schaum. A very distinct species, having the reflexed margin 

 of the thorax broader than in any of the following; the basal impressions, al- 

 though deep, are formed principally by the union of the reflexed margin with 

 the moderately convex disc, and are consequently very indefinite. The punctures 

 of the striae of the elytra are very distinct. 



20. P.moerens, piceo-niger, nitidus, thorace subrotundato, latitudine paulo 

 breviore, basi fere truncato, angulis posticis obtusis subrotundatis, margine re- 

 flexo postice latiusculo, impressionibus basalibus latis, tuberculo nullo, elytris 

 thorace fere duplo latioribus, parum convexis, tenuiter striatis, tripunctatis. 

 Long. -34 -38. 



Agonwm mcere?is Dej. Sp. Gen. 3, 152. 



Louisiana, Dr. Schaum; Pennsylvania. This species differs from P. tenuis and 

 others having fine elytral striae, by the greater breadth of the reflexed margin of 

 the thorax, (which, however, is narrower than in the preceding,) and by the 

 greater distinctness of the posterior angles ; the reflexed margin is sometimes 

 tinged with piceous ; the second elytral puncture is very near the second stria. 



21. P. laevis, niger, nitidus, thorace rotundato, latitudine paulo breviore, 

 basi late rotundata, angulis indistinctis, margine reflexo postice paulo latiore, 

 impressionibus basalibus profundis, tuberculo obsoleto instructis, elytris con- 

 vexiusculis, tripunctatis, striis profundis, vix punctulatis. Long. *35 38. 



Middle and Western States. The thorax is more rounded than in P. melana- 

 rius ; the tubercle of the basal impression less distinct, and the posterior angles 

 hardly perceptible. From P. atratus it differs by the more strongly reflexed 

 thoracic margin, the deeper basal impressions and the wider elytra. 



22. P. melanarius, niger, nitidus, thorace subrotundato, latitudine bre- 

 viore, basi fere truncata, angulis posticis obtusis rotundatis, margine reflexo 

 postice paulo latiore, impressionibus basalibus latis, subrugosis, tuberculo dis- 

 tincto instructis, elytris thorace vix sesqui latioribus, basi subemarginatis, minus 

 convexis, tripunctatis, striis profundis punctulatis, tibiis tarsisque obscure pices- 

 centibus. Long. *36 '4- 



Lee. Agassiz' Lake Superior, 205. 



Ago?rum melanarivm Dej. Sp. Gen. 3, 152. Kirby, Fauna Bor. Am. 26. 



Agonum maicrum Hald. Proc. Acad. Nat. Sc. 1, 300. 



Middle States, abundant; Vermont, Dr. Harris. The more reflexed thoracic 

 margin the deeper basal impressions, and the distinct tubercle near the angle 

 will readily separate this species from P. Harrisii. Dr. Harris thinks that this 

 is not the species intended by Dejean. As, however, the latter says that the 

 tibiae, tarsi and basal joint of the antennae are sometimes of a brownish color, I 

 think that he cannot refer to any other of our species having three elytral punc- 

 tures. A specimen having the thorax a little longer and less regularly rounded 

 on the sides, was sent me, by Dr. Harris, under the name Agomim nitidum \ I 

 cannot, however, find sufficiently definite characters to separate it. 



23. P.metallescens, supra nigro-aeneus, subnitidus, thorace subrotundato, 

 latitudine breviore, basi late rotundata, angulis posticis obtusis rotundatis, mar- 

 gine angustius reflexo postice vix latiore, impressionibus basalibus subrugosis, 

 tuberculo distincto instructis, elytris thorace sesqui latioribus paulo convexis, 

 basi subemarginatis, striis tenuibus profundis, subtiliter punctulatis, interstitiis 

 paulo convexis, 3io tripunctato. Long. *3 35. 



Sault Ste Marie, and northern shore of Lake Superior. Resembles in form and 

 sculpture the preceding species, but, besides the color, readily distinguished by 

 the narrower thoracic margin. The under surface, the antennae and feet are 

 black, slightly bronzed. 



24. P. t e n u i s, supra aeneo-niger, nitidus, thorace latitudine breviore, subro- 

 tundato, basi late rotundata, angulis posticis obtusis rotundatis, margine angus- 

 tius reflexo picescente postice sublatiore, impressionibus basalibus latis minus 

 profundis, subrugosis, tuberculo indistincto instructis, elytris thorace fere sesqui 

 latioribus, convexiusculis, tenuiter striatis, interstitiis planis, 3io tripunctato. 

 Long. '36. 



