W.B. Davis 1936. Head Big Lost River, 7895 ft., Custer Co., Idaho. July 22 few and far between. One thing of interest to me was the small size of the mounds thrown up by this animal here. A possible explanation is that most of the dirt is packed into the old winter burrows. The amount of earth in some of the cores is astonishing, and this having been removed from burrows used in the winter would leave a considerable space in which to pack dirt excavated in the new used burrows. I set in a burrow found in a dry island in the bog near the creek and caught one ?. There were no workings in the surrounding wetter area. Did the animal get there during the winter thru the snow, or did it move in the open across this bog? I believe the former idea answers the question better. I hunted in the p.m. for about an hour and shot 1 C allaspermosphiles at the edge of a small clump of fire. It ran to its burrow under a rock on the open hillside and died at the entrance. I took a ? L lupus bairdi in an open stand of Lodge Pole Pines. It hopped awkwardly