W.B. Davis 1936. 516 Specimens examined from Idaho in the American Museum. Microtus richardsoni macropterus 3 mi. S Montana line at Mt. Jefferson, Fremont Co., 7000 ft. Aug. 2-9, 1935 120640 ?ad. 207-65-27-12. Mammas 4ps. Tubercules 5/6 mossy seepage, dense-timbered creek, spruce, Hudsonian zone. R.M. Gilmore #189. 8/2 120641 ?ad. 195-60-28-13. Tubercules 5/6. Edge of seepage stream amid moss etc, in heavy spruce. R.M. Gilmore #202 8/3 120642 ?ad. 200-58-27-12 Tubercules 5/6 Mossy seepage, spruce. R.M. Gilmore #208 aug 4. 120644 ?ad. 235-75-25-12. Mammas 4ps. Big Spring- hole under log amid grass etc. R.M. Gilmore #235 aug. 9. 120645 ?im. 195-60-28-11. Under log at edge of stream, spruce. R.M. Gilmore #236. aug. 9. Taylor Cr. 5 mi. S Montana line at Mt. Sheridan, Clark Co., 7000 ft. 120646 ?ad. 195-60-27-12. Mammas 4ps. Tubercules 5/5½. Mouth of hole in seepage area, wet grass, willows, spruce, Douglas fir. R.M. Gilmore #288 Aug. 30. 1935 120647 ?im, 180-50-26-11. Tubercules 5/6½. Wet grass and willows - creek bottom, Doug fir & spruce. R.M. Gilmore #297 Sept. 1. 1935 120648 ?im, 163-47-26-11. Tubercules 5/6. wet grass & willows - creek bot. Doug fir & spruce. R.M.G. #298. Sept. 1. 120649 ?ad. 210-64-27-14, wet grass & willows - edge of creek, R.M.G. 307. Sept. 3. 1935