30 
U. S. P. R. R. EXP. AND SURVEYS—ZOOLOGY-GENERAL REPORT. 
Measurements. 
Current 
number. 
Locality. 
Head. 
Head 
and body. 
Tail with¬ 
out hair. 
Tail 
with hair. 
Hand. 
Foot. 
Ear. 
1684 
Fort Union....._ 
.75 
1.75 
1.17 
1.45 
.22 
.40 
.25 
1685 
.75 
1. 90 
1. 25 
1.50 
.25 
.40 
.25 
2048 
.75 
1.80 
1. 30 
1. 45 
.25 
.42 
.24 
Length of palate in 3096, 0. 25 inches. 
This species hears a close resemblance to S. cooperi, with the same dental formula of 32 teeth, 
hut is even smaller in every respect; one speciman (1685) weighs hut 38^ grains. The muzzle 
is shorter, and does not project so far heyond the incisors. The tail is appreciably shorter, hut, 
at the same time, a good deal thicker, and, like the feet, covered with larger and more lustrous 
hairs. The hind feet are considerably shorter and broader, the heel more hairy ; the three in¬ 
termediate digits shorter. The ears appear smaller. 
The skull is shorter, and perhaps not quite so slender. The teeth are much more extensively 
and deeply colored, being pitchy chestnut instead of light chestnut. The two anterior upper 
premolars are larger ; the difference in size between them and the next two much more strongly 
marked ; the internal lobes of the shorter anterior incisors more prominent. 
Diminutive as this species is, it is yet appreciably larger than the Sorex personatus, which it 
otherwise resembles. The hind feet are about the same length, but with the hands, much 
broader ; the tail, also, is larger and thicker in every way. 
List of specimens. 
Catalogue 
number. 
Corresponding 
No. of skull. 
Sex & 
age. 
Locality. 
When 
collected. 
Whence obtained. 
Nature of 
specimen. 
By whom col¬ 
lected. 
1685 
$ 
Fort Union, Nebraska 
1855 
Dr. F. Y. Hayden_ 
In alcohol. 
1684 
3096 
$ 
_do__. 
1855 
2048 
<? 
Fort Pierre, Nebraska. 
1856 
Lt.G.K.Warren.U.S.A. 
_do_ 
Dr. F.V.Hayden. 
SOREX PERSONATUS. 
Serex personatus, Geoff. Mem. du Mus. XV, 1828, 122 .—Ib. Mag. de Zool. 1833 ; pi. xiv. 
Fischer, Syn. 1829, 255. 
Bach. J. A. N. Sc. Ph. VII, 1837, 398, (from Geoff.) 
Aud. & Bach. N. A. Quad. Ill, 1854, 314, (copied.) 
Wagner, Suppl. Schreb. V, 1855, 548. 
Sorex longirostris, Bach. J. A. N. Sc. Ph. VII, 1837, 370 ; pi. xxiii, f. 2. 
Acd. & Bach. N. A. Quad. Ill, 1853 ; pi. cl, f. 3. (Description nearly same as that of Bach.) 
Sp, Cii. —Size very small. Ears large, as long as the adjacent fur. Hairs on the back short, but little over a line in length. 
Feet slender, but moderately long ; tubercles of soles not distinct; fore feet contained nearly twice in the hinder ones. Tail 
but a little longer than the body, exclusive of head ; about two-thirds as long as head and body, with a brush at tip. Third 
and fourth lateral upper teeth equal. Anterior upper incisors with an inner lobe. Upper premolars not imbricated. 
Color above and on sides, light chestnut brown ; beneath, dull white, with a tinge of chestnut. Length, 1J inches. Tail, 
l a \. Hind foot, 0.39 of an inch. 
