evotomys

from The Century Dictionary.

• noun A genus of myomorphic rodents, of the family Muridæ and subfamily Arvicolinæ, containing voles with semirooted molar teeth, ears distinctly overtopping the fur (whence the name), and sundry cranial characters, particularly of the palate. The type is E. rutilus, the northern red-backed meadow-mouse, a circumpolar species of which there are several varieties, as E. gapperi of the United States.