Erickson 1934 2. Ammospermophilus leucurus Q Intobaguito, Pima Co., Ariz. Jan. 25, 1934. 8:30- Followed up trill that has been heard at Tingajas Altas and Tule Tank and found four of these squirrels on flat south of wash; covered with Atriplex and occasional giant cacti, cholla, ironwood. When first seen two were chasing around and up on to fallen bran trunk of large cholla; later seen to run up to top of dead standing trunk about 7 ft. high; also seen to run & into holes in mound; soil fine dust; mound much turned into garr-sun caved in in several places under my weight. Trill given by one sitting on branches was half with fore feet on ground; later by one sitting erect. Trill gave place to series of sharp chips when one chased another. Set traps near these holes; took one, a female with six embryos, 11 mm. long; three in each horn of the utero, field no. 243.