Recent trapping has resulted in a better understanding of the ecology and distribution of Baiomys taylori in Arizona. This species has been reported from only two localities in Arizona: 5 to 9 miles west of Hereford, Cochise County, where it was collected in “tall grass and weeds” by Phillip M. Blossom in March, 1941, (Blossom and Burt, Occas. Pap. Mus. Zool. Univ. Mich., 465: 1–4, 1942), and 1 ½ miles southwest of Fort Grant, 4,600 ft., Graham County, where it was “taken in a habitat of mesquite, sacaton, yucca, grama, and some other low bushes” (Hoffmeister, Amer. Midland Nat., 55: 257–258, 1956). Specimens reported below indicate that this species is to be expected in local areas of dense grass throughout southeastern Arizona at elevations of 4,000 to 5,000 feet.