_Remarks._--The single adult male, obtained by Alcorn, has been compared by Dr. Henry W. Setzer with specimens of _Microtus muriei_ Nelson, _M. miurus miurus_ Osgood, and _M. m. oreas_ Osgood in the United States National Museum. He reports that the specimen is related most closely to _M. miurus_ but exhibits characters by which it is, at least, subspecifically distinct from these two forms of this species. Three specimens of _M. andersoni_ Rand and one of _M. cantator_ Anderson, borrowed from the National Museum of Canada are less mature than the specimen in question. Even so, the male from Fish Creek is less gray than _M. andersoni_ and as seen from measurements of the type, an adult male (Rand, 1945:42), is larger with longer tail and has a shorter and narrower skull and is judged to be taxonomically separable. _M. cantator_ was named from two specimens; both the paratype (seen by me) and seemingly the type are too young to show clearly subspecific characters. Alcorn's specimen is tentatively referred to _M. cantator_ until some adult topotypes can be obtained. Measurements of the male, No. 21539, from Fish Creek, are: Total length, 152; length of tail, 30; hind foot, 22; condylobasal length, 28.0; basal length, 26.6; length of nasals, 7.1; zygomatic breadth, 13.8; breadth across auditory bullae, 11.5; least interorbital breadth, 3.3; alveolar length of upper molariform tooth-row, 6.2. Alcorn took this specimen in an area above timberline where a low growth of willow was the dominant vegetation. Traps were set where he had seen a mouse go into a small burrow. The next morning, August 18, 1947, he found this specimen and two _Microtus oeconomus macfarlani_ in his traps. Microtines of the subgenus _Stenocranius_ from continental areas of Alaska and Northwestern Canada are represented in collections by a few specimens from widely separated localities. Lacking material from intermediate localities, describers have given specific recognition to several of these isolated populations. Future collecting will be necessary to disclose whether the North American mice of this subgenus belong to one or to more than one species and may disclose whether or not there has been more than one invasion of the North American continent by members of this Asiatic group. Microtus longicaudus vellerosus J. A. Allen Long-tailed Meadow Mouse _Microtus vellerosus_ J. A. Allen, Bull. Amer. Mus. Nat. Hist., 12:7, March 4, 1899. (Type from upper Liard River, British Columbia, Canada.) _Microtus longicaudus vellerosus_ Anderson and Rand, Canadian Field-Nat., 58:20, April 1, 1944.