W.B. Davis 1935. Elba, Cassia Co., Idaho, June '2. I remember seeing squirrels there in 1918. On my way over here from Rupert on the 5L I collected a single young squirrel which appears to be C. [illegible] There is quite a colony near Cottrell, about 10 miles east of Elba. They were living on an area devoid of Artemisia, but one heavily covered with grasses. The typical weak leurodow whistle was given by these squirrels, but their burrow systems were lacking in the big mounds found at the type locality of leurodow. Here at Elba I find that C. oregane and C. armatus meet and overlap in their ranges. Each appears to occupy the same type of habitat as far as I can see. Each appears to be limited to watered areas and both can be taken on this ranch, although I have never taken the two in the same limited area - the territory of a colony. C. armatus is the common one on this ranch and its range extends west as far as Mt. Harrison at least. I found several individuals of