526 U. Ss. P. R. R. EXP. AND SURVEYS—ZOOLOGY—GENERAL REPORT. 
List of specimens. 
nA | Meastrements. 
| laa 
ae ean| Liners 2|& ne 
STS iz ls _ ‘S é s 
= = S o | = ‘Ee 
5 | S * Locality. When col- | Whence and how > 3 h , EB ; ka | S = | = 3 ~ 
Elo) & lected. obtained. o Sel ee ee ii ee 
2/e/% 6 = S 2 = 4) ge 6 | 5 S 5s | 
al\e 2 ® s = ‘] 21.08 ei 8 & Tee, ze 
6 | | R 7 mote) a | em fe eee ee 
a ee SSS ——— 
| | | 
2828 |: 3 Muskeeget Island, Mass.| July, 1856 | Dr. T.M. Brewer. Inalco...) .57 | 1,12 | 1.37 | 4.60 1.77 2.07 | .42 8B | .ccces|eceeee 
2829 |.... ro -55 | 1.10 | 1.31 | 4.42} 1.56 | 1.81] .41 90 |\iscscsletewss 
2830 '3213 ie) -56 | 1.08 | 1.35 | 4.30 | 1 65 | 1.94 |...... -85 | 1.11 65 
283) 3214 J 59 | 1.18 | 1.40 | 4.67] 1.84 | 2.94} .45 -90 | 1.22 69 
2832 (3215 3 40} .81 | 1.04 | 3.00 | 1.28 | 1.48 38 80 |ecceae . 
QESZ ree eens -40 -86 | 1.08 | 3.10 1.31 | 1.54 | .40 =) We FS sees 
| | | 
ARVICOLA RUFIDORSUM, Baird. 
Sp. Cu.—Size large. Above, bright rufous, or reddish chestnut; this tint paling very insensibly to the belly, where it 
changes rather abruptly to reddish white. No dorsal band. Feet reddish. Under surface of tail whitish. 
This species is of large size, nearly equal, indeed, to the A. ripairus. There are no very 
prominent peculiarities in form; the ears being moderately large, well furred, and concealed by 
the hair of the head. The feet are large and broad; the soles with six tubercles; the posterior 
rather longer than usual. 
The upper parts and sides are a bright chestnut red, slightly obscured by dusky tips to the 
hairs, although these are only visible on close examination. The under parts of body and tail 
are white, tinged with dull yellowish ; the feet are reddish. 
This species, in its bright colors, resembles no other found in the eastern portion of the conti- 
nent, except, perhaps, 4. pinetorum. This, however, belongs to a different section, with much 
shorter head, tail, and feet. From A. gapperi, the uniform red of the back and sides will at 
once distinguish it. It comes much nearest to A. occidentalis, but is larger; has the red more 
vivid, and has no trace of the darker broad dorsal band. The tail, also, is shorter. 
The only specimen of this species I have ever seen was obtained at Holmes’ Hole, Massachu- 
setts, and belongs to the Boston Society of Natural History. 
List of specimens. 
| | Measurements. 
Catalog’ e'Correspondinug, Locality. Whence and how Nature of S zy = T “a a 
| > we 
number. No. of skull. obtained. specimen. g | #2] 8s 3S 3 zy 3 
| SH i ° % os ta i = a 
| Stal Witch | sot lace | s =) 
ea” |ae | es | 88] 2 | B 
a LM apa [iss petal a 
901 1946 Holmes’ Hole, Mass.| Boston Soc. N. H. | Skin.-...-- 4.20 | 1.55 | 1.85 82 | 1.11 | .62 
(borrowed.) 
| 
| 
-, 
