462 
U. S. P. R. R. EXP. AND SURVEYS-ZOOLOGY-GENERAL REPORT. 
at the same time by him are palpably wilful fabrications, either of his own or of some one 
imposing upon his credulity, the Musculus leucopus is sufficiently applicable to he retained. 
Judging from the color and the extreme shortness of tail, I am inclined to believe that Rich¬ 
ardson’s species is the Hesperomys sonoriensis, var. nebrascensis. 
The Mus noveboracensis of Selys is an excellent description of the present species. 
The Hesperomys maniculatus of Wagner is based on specimens from Labrador, which appear 
to he the same as those from Halifax. Should these not he the same with H. leucopus, from 
Middleboro’ and elsewhere, then the name will he retained ; otherwise it must he reduced to a 
synonym. His comparisons were made chiefly with Richardson’s description of what I consider 
to he a different species; and besides this, one strong point of distinction was supposed to he 
the hairy heels of the new species, those of H. leucopus being erroneously supposed by him to 
he naked. 
The American wandering mouse of Barton refers probably either to this species or to the 
H. myoides. The Mus leucopus of Thompson is a good description of H. myoides, his original 
specimen and type being now Ho. 833 of the Smithsonian collection. 
List of specimens. 
| Catalogue number. 
Corresponding number of 
skulls. 
| Sex and age. 
Locality. 
When col¬ 
lected. 
Whence and how ob¬ 
tained. 
Nature of 
specimen. 
Measurements. 
j Nose to eye. 
z 
j Nosetooccip. 
| Nose to tail. 
| Tail to end of vert. 
o 
o 
EH 
| Length of fore foot. 
Length of hind foot. 
3 
| Width of skull. 
Height of ear. 
1373 
Halifax, N. S. 
Dr. J. B. Gilpin. 
Skin. 
2450 
.rlo. . .. T _ 
1358 
| 
John Downes. 
Mounted 
2743 
g 
Hingham, Mass. 
T. M. Brewer. 
In alcohol.. 
.53 
.90 
1.15 
3.65 
3.35 
3.53 
.40 
.82 
66 
895 
| 1944 
<? 
Middleboro’ Mass. 
September... 
J. W. P. Jenks. 
Skin. 
1.25 
3.50 
3.33 
3.60 
1.05 
.54 
893 
1942 
1.17 
3.17 
2.17 
2.33 
1.03 
.51 
891 
1940 
g 
1.08 
2.75 
3.25 
896 
1 1945 
1.08 
3.00 
2.50 
2.60 
.96 
897 
1946 
o 
'3.25 
2.50 
2 66 
1.01 
753 | 
1938 
V 
o 
1.04 
.54 
875 
1926 
% 
M 
.94 
876 
1927 
1.07 
894 
1943 
o 
September 
1.17 
9 93 
2.42 
2.50 
878 
1929 
S' 
May. 
.90 
1434 1 
Mar. 29,1856 
1.17 
3.50 
3.25 
3.42 
827 
1988 
c? 
September... 
. 
1.17 
3.75 
3.50 
1105 
November 9 1 
4.50 
3.40 
.83 
1112 
2713 
.do. 
4.30 
2.90 
.80 
Aug. and Sep. 
In alcohol.. 
.55 
.95 
.92 
1.16 
3.55 
.36 
.80 
2714 
.50 
1.14 
3.41 
.35 
.83 
2715 
.50 
.90 
1.14 
3.13 
3.25 
.36 
.80 
2716 
.50 
.90 
1.14 1 
3.30 
3.00 
.58 
.80 
.50 
.91 
1.14 
3 35 3.15 
.35 
.81 
2720 
2721 
:.i 
.50 
.90 
1.14 
3.30 
3.10 
.34 
.80 
.52 
.94 
1.19 
3.45 
3.10 
.40 
.83 
2722 
.51 
.93 
1.15 
3.30 
3.16 
.36 
.80 
2723 
2724 
.49 
L. 12 
3.00 
3.00 
.36 
.78 
.49 
.8b 
L.ll 
2.95 
2.75 
.36 
.79 
2725 
.j 
.*.!. 
.50 
.95 
L.10 
3.15 
3.12 
.80 
2726 
.52 
.94 
L. 15 
3.50 
3.21 
.40 
.78 
2727 
. . .... 
.54 
1.02 
L. 19 
3.45 
3.38 
.85 
.! I | 
1 These measurements, as of all in the column, 895-827, were taken before skinning. The same specimen after being skinned measured to root of 
tail 4.30; tail, 3.00; hind foot, .82. 
