452 
U. S. 1*. R. R. EXP. AND SURVEYS-ZOOLOGY—GENERAL REPORT. 
List of specimens. 
There is a small mouse, described by Audubon and Bachman, under the name of Mus caroli- 
nensis, which appears different from Reithrodon humilis, hut in the grooved incisors seems to 
belong to the same genus. They mention it as existing very sparingly in tire maritime districts 
of South Carolina, and found usually in low grounds, partially inundated. The description is 
as follows: 
Reithrodon carolinensis. 
Mus carolinensis, Atjd. & Bach. J. A. N. Sc. Phil. VIII, n, 1842, 306 .—Ib. N. Am. Quad. Ill, 1854, 332. 
Hesperomys carolinensis, Wagner, Wiegm. Archiv, 1843, ii, 51. 
Sp. Ch. —Upper fore teeth slightly grooved ; tail, half an. inch longer than the body; ears long ; color, light plumbeous; 
under parts and hind feet scarely lighter. 
Point of nose, lips, chin, fore feet, and nails, white ; whiskers, dark brown. A narrow fawn- 
colored ring round the eye. Ears, legs, and tail, light ashy brown. Fur on the back and sides 
uniform light plumbeous ; the under surface scarcely a shade lighter. 
Inches. 
Lines. 
Length of head and body_ 
2 
4 
tail_ 
2 
9 
Height of ear_ 
4 
Length of tarsus_ 
u 2 
The grooved incisors distinguish this species from the common mouse, and the Hesperomys 
leucopus; from the other North American Reithrodons the dark color of the belly and hind feet 
constitute a decided characteristic. 
