530 U. Ss. P. R. R. EXP. AND SURVEYS—ZOOLOGY—GENERAL REPORT. 
The description of A. montana, given by Mr. Peale, is too short to describe fully its characters, 
and omits to mention some of most importance. As far as it goes, however, it agrees pretty 
well with the animals collected by Dr. Newberry, and, as both gentlemen gathered their speci- 
mens in much the same region, I have given them the same name. Mr. Peale obtained his near 
Mount Shasta, as he informs me. Several specimens belonging to Lieut. Bryan’s collection, 
from the upper waters of the Platte, though differing in some slight points, I refer to this 
species, rather than to make a new one. 
List of specimens. 
a Measurements. 
ag 2 aay : | 
Pe a = | | | ae eo " 
s|%s lens an esa 33 la rs | 
E eee Locality. When col- | Whence and how} = SMe al el S ES ES We) NS, | _ | Collected 
Be | eo lected. obtained. 2 Zan =e ee ta sl2l=l/s)eleié by— 
3 /2#/5 Bett VORA = ore Va (Pa FN = a = oe = = 
#|3|2 z e /ereyeyetais [es |ay Seng 
gi Els B| 2 [gizi2iglalgizizizlgisle 
So |S ja Oo} 4 lzlzlzl2\sj/alelelalalals 
—— —|— eae ee er —! fae 
| | | fiat | 
1263 2219) J Upper Des Chutes,/1855........ Lt. R. S. William-|....)/Mount’d ....|..../..-- 3.50)1.331.53 .36) .77 42.25) Dr. New- 
1 | | 
| Our. | | | 
1270 2221) d |... d0.cesse asics Pidom | seealeeas|soee Jsse0] +. Ve sse) wsan| sseslasee| seen 
| 
1269 2223) CG (Upper Klamath Lake GOs. cs leces}eous{uses 4.75/1.802.00 .40 
1271 | 2223)....|Lost River, Cal..... Bc) leno ead Seca Parr /4.50|1.55 1.70) .37) 
22534 3219)... Petaluma, Cal ..... .-.(Skin...| .55)..../1.38)....(1.76 | .42 
? 370 1284)..../Monterey, Cal...... Jeever- ce cv-{iut. Trowbridge... +++ -/Mount’d P65 vee. {eee«/4.00)1,40/1.50 39. 
721907' 2607|.... Pass Creek, Neb....|Aug. 10,1856/Lt. F. T. Bryan, ..| 243/Skin ..,|....|..../1.25,5 Oe ee 00 wah . bos Neate W.S.Wood 
| | 
271926 3218)....| Medicine Bow Creek, Aug. 26,1856)...... dO... ..0 ee 307|..do....) .45 -90.1.10)3,28)1.20).... 40.73 or ane e0eedO.. cee 
| Nebraska, | | | 
POL9D5 loinc Ge on|eences GO. vrepeec cass moe Oeslvsa 309In ale.., .40 801,103.20 1.19... 34) 010). ccc lewen BAT EO aseedO.aee* 
| 
AMES yl aoaslansl Facade COs emcis\smsieaie'| Sstaikiselo canes eoee|..0....| e490) .88.1.15,3.10/1.25).... +38 et2laese|see*lconsfuccalbage do....- 
771923 | ++++|++../Laramie river, Neb.,|Aug. 5, 1856, 201)..do.... ~57/1.20 1.40)... voveleves sal +80) .ceeloce hes dO. . eee 
: | | 
} Measured before skinning. 
ARVICOLA LONGIROSTRIS, Baird. 
Sp. Cr.—Size large, (43 inches.) Skull, 1.08 inch. Fur long, .55 of an inch above. Ears rather small, three-fourths 
the length of hind foot, sparsely coated with short hairs. Feet very short ; hinder ones less than three-quarters of an 
inch long. ‘Tail % the body, the vertebre twice as long as the hind foot. 
Above dull yellowish chestnut, or rufous brown, mixed with black, yet without any distinct rusty. Beneath dirty 
whitish ash Line separating the colors rather distinct. Feet light brown. Tail nearly unicolor, paler beneath at the 
base. : 
Skull 1.08 % .61, or as 100 to .55. Muzzle of skull very long. Distance between upper molars and incisors more than 
one-third the whole length of the skull. 
4385 2.) This specimen is indicative of a large and stoutly built animal, nearly equal to the 
largest eastern species. The whiskers are not as long as the head, and mostly of a light gray 
color ; a few black ones are interspersed. The hair is rather loose and coarse, with but little 
lustre ; this may, however, be owirg to immersion in alcohol. The hairs on the back measure 
about .55 of an inch in length and about half as much on the belly. 
The ears are rather small, almost as broad as long, or nearly orbicular, and about three- 
fourths the length of the hind foot, or longer than the fore foot ; they are thin and coated on 
both sides with rather sparse and short hairs. The antitragus is not large. The feet are quite 
unusually short for members of this group, the hind foot measuring less than 75-100ths of an 
