RODENTIA MURINAE HESPEROMYS PALUSTRIS. 485 



In the preceding pages I have mentioned, either as distinct species or as synonyms, all the 

 described Hesperomys of North America, with the exception of the following : 



HESPEROMYS CAMPESTRIS, Leconte. New Jersey. 



Hesperomys campestris, LECONTE, Pr. A. N. Sc. Phila. VI, 1853, 413. 



Arvicola (Hesperomys) campestris, AL T D. & BACH. N. Am. Quad. Ill, 1854, 295. 



"Hair plumbeous black, above tipped with brown, beneath with cinereous brown, darker 

 about the mouth ; head large ; ears large, oval, blunt, thinly covered, both within and without, 

 with very short, closely appressed hair ; legs and feet brown ; tail well clothed with tolerably 

 long hair. 



"Length, 3.40 inches; head, 1.20; ears, .55; width, .40; fore leg, .45; hind leg, 1.60; 

 tail, 2.70. 



"This species was found in the collection of the (Philadelphia) Academy, and labelled Mus 

 campestris, New Jersey. The specimens were preserved in alcohol, and therefore scarcely fit to 

 be described ; there was, however, enough to show that they were different from any hitherto 

 described animal." 



Of the affinities of this species I will hazard no conjecture, never having seen the specimen 

 described. 



