122 Memoirs on the Coleoptera 



it is from the northern shore of Lake Superior. Affine Kirby, also 

 seems to be different, as Kirby states that the thoracic margins 

 are not reflexed at base and that the foveae are large, deep and 

 circular; it is 8 mm. in length and the locality is not recorded; 

 it is said that the three dorsal punctures are placed as in harrisi 

 and the species is doubtless closely allied. Piceum Lee, is a valid 

 name in Agonum, as the previously described Platynus piceus Dej., 

 is a true Platynus, with the elytra nearly twice as wide as the 

 prothorax; so I have not adopted propinguum, substituted for it 

 by Gemminger and Harold. The name atratum Lee, is however 

 preoccupied in Agonum, and we must therefore adopt mutatum 

 G. & H., which name was overlooked by LeConte in his Brooklyn 

 revision. The name molestum Lee, is substituted above for Ice^e, 

 for, as this name had been used two or three times before, it is 

 possible that some one of them may be valid in Agonum. In this 

 case it may be necessary to change the name of molestus Mots., 

 from Kamschatka. Agonum metallescens Dej., is a variety of 

 viduum, noted by the author as occurring in Croatia; this it would 

 appear must invalidate the name metallescens Lee, and I have there- 

 fore changed the latter to lacnstre, as above. 



In fossigerum Dej., there is a very exceptional sexual inconsistency 

 in form and lustre, resulting in some synonymy as shown ; pertinax 

 is an allied but much smaller and still more slender species, differing, 

 besides, in the notably shorter antennal joints. In tumidulum 

 the form of the body is stouter than in fossigerum, the size smaller 

 and the sexual differences less pronounced; it differs from either 

 fossigerum or vegetum in having a pronounced protuberance of the 

 surface between the pronotal foveae and the sides. Vegetum differs 

 from fossigerum in the feebly impressed pronotal foveae and less 

 oblique sides posteriorly. Columhicum is a smaller species, with 

 shorter elytra and more abbreviated antennal joints; it has the 

 surface between the foveae and the sides nearly flat. 



I have been unable to identify the species described by Dejean 

 under the name Agonum mcerens, and at first thought that mordax, 

 described above, might be a correct determination of it, as the 

 elytral striae are similarly very fine and the intervals flat as stated 

 by Dejean; but, the assertions that mcerens has no suggestion of 

 bronze tint, which is very apparent on the elytra oi .mordax, that 



