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ARVICOLA MONTANA . — Pea ie. 
Peale’s Meadow Mouse. 
A. Forma rotundata ; capite magno ; auribus mediocribus et vellere poene 
yestitis ; dentibus flavis ; oculis parvis, nigris ; pilis subtilibus sericisque, 
in dorso brunneis nigrisque intermixtis ; infra plumbeis. Cauda pedibusque 
brevi nitente pilo indutis. Mystacibus albis nigrisque : mammis octo, qua- 
tuor in abdomine, in pectore totidem. 
CHARACTERS. 
Form rounded , the head large , ears moderate and nearly covered with fur , 
teeth yellow ; eyes small, black ; hair fine and silky ; that of the back brown 
and black, intermixed j beneath lead-coloured ; tail and feet covered with short, 
glossy hairs whiskers white and black teats eight in number, four pectoral, 
and four abdominal. 
SYNONYME. 
Arvicola Montana. — Peale, Mammalia and Ornithology United States Exploring 
Expedition, vol. viii., p. 44. 
DIMENSIONS. 
Total length inches, including the tail, which is 11 inches long. 
GENERAL REMARKS. 
Our specimen was obtained on the 4th of October, near the head waters 
of the Sacramento River, in California. (Peale.) 
In relation to Arvicola Riparia of Ord, we have concluded that it is 
identically the same as A. Pennsylvanica of that naturalist. We have 
given an account of this animal at p. 341, Vol. I. We merely mention 
that it is so much better known as A. Pennsylvanica than as Riparia, that 
we would, setting aside the dates of description by Mr. Ord, prefer to let 
the name of Pennsylvanica remain, and for the future consider riparius as 
a synonyme only. 
We may further remark, that had we had an opportunity of examining 
