Alfred Brazier Howell, Descriptions of two new rodents of the genus Phenacomys (1923)
“ Phenacomys intermedius levis, subsp. nov. Alberta Phenacomys Type from Saint Mary’s Lake, Teton County, Montana. Male adult; No. 72,405, U.S. National Museum (Biological Survey Collection) ; collected by A.H. Howell, May 23, 1895; original No. 13. Diagnosis.—Smallest race of this genus, being somewhat smaller than P. i. intermedius but indistinguishable from certain skins of the latter in color. The skull of levis is much smaller, with rostrum, which although relatively shorter, is more robust. The bullae are proportionately larger and the incisive foramina smaller. ”
