= 
30 U. Ss. P. R. R. EXP. AND SURVEYS—ZOOLOGY—GENERAL REPORT. 
Measurements. 
Current Locality. Head. Head Tail with- Tail Hand. | Foot. Ear. 
number. and body. | out hair. | with hair. | 
1684 | Fort Union_...--------- 75 1.75 Thay 1.45 22 | 40 25 
NGRG. eal eee Woes sas eee eee 75 1.90 1.25 1.50 er) 25 
D118 mallee dot. 2. see counsel 75 1.80 1. 30 1.45 295 ot nd2 24 
. | 
Length of palate in 3096, 0. 25 inches. 
This species bears a close resemblance to S. cooperi, with the same dental formula of 32 teeth, 
but is even smaller in every respect ; one speciman (1685) weighs but 38} grains. The muzzle 
is shorter, and does not project so far beyond the incisors. The tail is appreciably shorter, but, 
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 | Corresponding | Sex & Locality. When Whence obtained: | Nature of | By whom col- 
number. | No. of skull. | age. collected. specimen. | lected. 
_ | _ — | 
| | 
IEG WeonoeSoagassoe ¢ | Fort Union, Nebraska 1855 Dr. F. V. Hayden----| Inialeohol!) <5. —- Soaeee 
1684 3096 ier ease (eae ee 1856,44) |bosaseens do = =~ sear Jz. .dOs 32] is iee eee 
aS tae ane aee ene Q | Fort Pierre, Nebraska.) 1856 Lt.G.K, Warren, U.S.A.|-.--do..-.| Dr. F. V. Hayden. 
lie 
SOREX PERSONATUS. 
Sorex personatus, Georr. Mem. du Mus. XV, 1828, 122.—In. Mag. de Zool. 1833 ; pl. xiv. 
Fiscuer, Syn. 1829, 255. 
Bacu. J. A. N. Se. Ph. VII, 1837, 398, (from Geoff. ) 
Aup. & Bacu. N. A. Quad. III, 1854, 314, (copied.) 
Waener, Suppl. Schreb. V, 1855, 548. 
Sorex longirostris, Bacu. J. A. N. Se. Ph. VII, 1837, 370; pl. xxiii, f. 2. 
Aup. & Bacn. N. A. Quad. III, 1853; pl. cl, f. 3. (Description nearly same as that of Bach.) 
Sp, Cu—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, witha 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, 1} inches. Tail, 
1}. Hind foot, 0.39 of an inch. 
