186 MONOGRAPHS OF NORTH AMERICAN RODENTIA. 
magiis, paululum vellere exstantibus ; supra fulvo-badius, intimé nigro permix- 
tus, infra e griseo-brunneo albescens. 
Hasitrat.—Oregon and Washington Territories (Columbia River, July 
21,1835, Townsend; the type. Puget Sound and Shoalwater Bay, Cooper 
and Suckley. Cascade Mountains, Newberry).. 
One of the larger meadow mice, 5 or 6 inches long, head 14, tail 24, 
hind foot 1, fore foot nearly 4, ears nearly # high and as much or more wide, 
projecting a little from the fur; color above blended yellowish-brown and 
black ; below whitish, shaded with grayish-brown. 
TaBLE XLVII.—Measurements of eighteen specimens of A. TOWNSENDI, both dry and alcoholic. 
Nose to— Tail to— 
3| 
5 Locality. Collector. = e|e Remarks. 
= . a=) + z ) : : 
5 ae peel Pea | ces ec sea preset eee 
Z Ala l}olale | a ]e)h] a 
Sears Shoalwater Bay ..| J. G. Cooper.-..-.|.--...|------]------ 5.50 | 2.15 | 2.45 | 0.45 | 1.05 | 0.75 | Dry. 
2 2.20 | 2.45 | 0.50 | 1.00 | 0.75 ..do. 
2.30 | 2.50 | 0.50 | 1.00 }.....- ---do. 
2396 Puget Sound.-.... 2.30 | 2.50 | 0.45 | 1.00 |...... peti tay 
Bs An Straits of Fuca...) 02d0 | 0-22. cone) coe n ee |eeenac|eaoaee| On Oee |) 2.1060 | exO8)| NOG) Lea] aaeeee | korean 
3177 | Simiahmoo - ...... CBR. Kenuenly|->-es|sceeon lea 4.75 | 1.70 | 2.10 | 0.44 | 0.88 |...--. Dry. 
5022 | Puget Sound...... pees LO ietae eee 0.52 | 1.03 | 1.28 | 4.25 | 1.75 | 2.00 | 0.45 | 0.92 ]...... Alcoholic. 
5026/2 = e700). - doktacesctee 0.50 | 1.10 | 1.30 | 5.25 | 2.30 | 2.45 | 0.50 | 0.99 | 0.55 |....do. 
5029 |....do ..- LAS 5.60 | 2.00 | 2.25 | 0.52'| 1.00 | 0.65 |....do. 
5030 |....do 35 5.25 | 2.40 | 2.80 | 0.44 | 0.95 | 0.60 |....do. 
#5032 |e dO paes= ee ese eRe 4.25 | 2.75 | 3.05 | 0.48 | 0.88 | 0.52 |... .do.t 
9861 Columbia ‘River? = -|0 250": c0-55 coal ee — cee pms ee | mae | eee leeeen el Coen eke a] eae [eee Alcoholic; young. 
LONG |e eM O) ces seo | BAO elena eel smmee | teers | See tell met eel | et el neta te eae | ate edo ys, 
10016 2. 30) || 2.50 |.---- OSSD i ease Alcoholic. 
10017 2510) ) 2250 ee 0.82). -2 2... ee2dos 
10018 2.20 | 2:35 |...... 0.75 |.---- ..-.do. 
10019 2.40 | 2.60 }..-... 0,;20)||Po=== ..-.do. 
10020 |... 55 : LOO] eee Olena ee Oia ae -- do. 
T0021) | --=.-dosas-5---2- ee see 1= coh oe = cul ceseas| ceases eoeees Seto) ||) 5200) | 2220) ae Os cB) | ence EA 
71275 | Cascade Mountains| J.S. Newberry..|......|......|...--- 5.25] 1.75 | 2.00| .... | 1.00 
* Measurements copied from Suckley, op. cit. ; specimen not seen. 
+ This specimen (since skinned out of alcohol) is about the longest-tailed American Arvicola we ever saw. and has 
given us some anxiety. It is small for townsendii, with feet at a minimum and lacking a peculiar robustness those of town- 
sendit generally show ; the ear likewise is remarkably small. But we can make no other disposition of the specimen. 
Nore.—As will be seen from the figures, the Columbia River series, some of which, at least, appear full grown, are 
not larger than ordinary riparius, and it is mainly on account of the great comparative length of the tail that we assign them 
here. They offer a gentle transition into ordinary riparius. No. 1275, as elsewhere noted, is still more doubtful ; it has the 
tail as short as is usual in riparius, but the feet beyond the maximum of ordinary riparius—exactly the reverse conditions of 
the Columbia River series. 
Descriprion (of No. 75's).—In form, this animal does not differ from 
other species of this section of the genus; nearly the usual relative propor- 
tions of head, body, tail, and feet being exhibited. The tail, however, will 
certainly average longer than in r/parius; for in specimens no larger than the 
latter, the tail averages at or beyond a maximum of riparius. This length 
