. The Canadian field-naturalist. December, 1931J The Canadian Field-Naturalist 211 precisely similar situation to those taken at Lodge Creek. The runways here, however, were more intricate and extended over a greater area through sparse grass to include several clumps of sage- brush, the extremes of which were fully 15 yards apart. The runways invariably terminated at holes under the roots of the sage. A female was taken here during the last week of August which contained five small embryos; she and three well- grown immatures were the sole occupants of the one habitat found. This was in longi
. The Canadian field-naturalist. December, 1931J The Canadian Field-Naturalist 211 precisely similar situation to those taken at Lodge Creek. The runways here, however, were more intricate and extended over a greater area through sparse grass to include several clumps of sage- brush, the extremes of which were fully 15 yards apart. The runways invariably terminated at holes under the roots of the sage. A female was taken here during the last week of August which contained five small embryos; she and three well- grown immatures were the sole occupants of the one habitat found. This was in longitude 107° 47' West, 21 miles north of the 49th parallel. At Rock Creek, Saskatchewan, (Camp 11, Alt. 3000'), south of Wood Mountain, and two miles north of the International Boundary, the species was found at its maximum abundance. Many colonies were found and only time was required to ensure the collection of a large series of specimens. The first colony found was on a short-grass bench, sparsely scattered over with sage-brush, 100 feet above Rock Creek. The main runway communicated with burrows at nine clumps of sage over a total distance of 80 to 90 feet. Nu- merous branch trails led out in all directions for purposes of feeding in the surrounding areas of short, shrivelled grass. The total linear length of the trails in this family network amounted to â about 250 feet. The number of burrows under and beside the roots of the sage was 25. Again was determined the amazingly small number of animals present in relation to the length of worn trails and the large collection of burrows. Four individuals only were taken here after persistent trappingâone adult female, two immatures and one juvenile. A mile to the south of this haunt was another, but this time all the holesâ24 in numberâ^were scattered over the face of a grassy slope facing the west. The grass here was exceedingly sparse, and the runways wound about, for the most part quite in the open, sometimes over bare soi
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