196 



MONOGRAPHS OF NORTH AMERICAN RODENTIA. 



f ARVICOLA RIPARU'S vak. BUREAUS, Rich. 

 Little Northern Meadow Mouse. 



Arvicola borealix, Richardson, Zool. Jonrn. 1828, 517; Fn. Bor.-Aui. i, 1820, 127. — Aud. & Bach., Q. N. A- 



iii, 1803, 134, pi. 129 (from Richardson).— BaIRD, M. N. A. 1857, 549 (from the same). 

 " Hypmlaus bnrealis, YVagnku, Suppl. Schreber, iii, 1843, 593" (the same). 

 Arvicola (ripariUB var.T) borialis, GOUES, Proc. Acad. Nat. Sci. Phila. 1874, 190. 



Diagnosis. — A. ripafio simi/limus, ted minor, arlubus brevioribus, hir*uti- 

 oribus, rel/ere lanuginosiqre. 



Averaging a little smaller than true riparius (three or lour inches long), 

 with smaller and hairier ears, tail, and feet. 



Habitat. — Northwestern America. 



Table XLIX. — Measurements of ilnrty-otie small Arctic Anvicoi-jE of the RIPARIUS type, supposed to repre- 

 sent a variety borealis, Rich. 



N. B. — They connect directly with specimens of the preceding enumeration. 



* Taken iii -winter, and apparently adult. Its length cannot now be ascertained with accuracy ; but it is a tiny animal, 

 apparently falling abort of 3 incbes. 



t Contained 7 foetus. Tbiaand tbeotbers measured fresh do not appear to be so much larger than tbe rest as the figures 

 would indicate. 



