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, Lecontr, Pr. A. N. Sc. Phila. VI, 1853, 413. 
Arvicola (Hesperomys) campestris, Aup. & Bacu. N. Am, Quad. IIT, 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; 
taal, 2.70, 
‘«This species was found in the collection of the (Philadelphia) Academy, and labelled Jus 
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. 
