RODENTIA-ARVICOLINAE-ARVICOLA. 
553 
I have thus mentioned all the residuary species of N\ American Arvicola that have come to 
my knowledge. There are still some others described as Arvicola , but really belonging to other 
genera, and have been already quoted under their appropriate heads. These are principally as 
follows: 
Arvicola campestris , Aud. & Bach. = Hesperomys campestris, Lee. page 485. 
ferrugineus, Harlan = Sigmodon Mspidus, Say & Ord., page 502. 
hortensis, Harlan ~ the same species, probably. 
nuttalli, Harlan == M r esperomys nuttalli, page 467. 
oryzivora, Aud. & Bach. = Hesperomys, (Oryzomys) palustris, page 482. 
sonoriensis, Aud. & Bach. = Hesperomys sonoriensis, Lee. page 474. 
texana , Aud. & Bach. = Hesperomys texana, Woodhouse, page 464. 
texiana, Aud. & Bach. = Sigmodon texiana f, page 552. 
Hypudaeus leucogaster, Max. = Hesperomys ( Onychomys ) leucogaster, page 480. 
The species in the preceding enumeration most likely to be additional to those I have described 
in detail are: Arvicola borealis, drummondii, nasuta,? richardsonii, rubricata, and xanthognathus , 
70 L 
