Koford 313 Cynomys ludovicianus November 3, 1955 New York, N.Y. to be ready April 30, 1956. As soon as practical send sketch of content for suggestions. Remain in Colo. un- til end of year, then work at Berkeley. November 4, 1955 Washington D.C. at U.S. Nat. Museum, Stanley Young told me that his black-tailed prairie dog pet had intermitted (contradicts his printed acct.? ). He says Wichita Mtns. range very much "beat up" by grazing in 1935. Viola Schutty helped me find specimens & files. There is card file with many notes by V. Bailey and others, filed by species & sub-species & state. This apparently not kept up, but old information excellent. (= the "Merriam file"). Copied many portions of these notes. (Nor original info upon which reports by Bailey, Nelson, Cang, & others have been based. Merriam has some notes in file but modest) reference to the huge C.L. town he tells of in 1902 ybook Agriculture. Early estimates numbers often based on number holes per acre, according to this file, maxima being 25 to 30. C.H. Merriam probably used this esti- mate of 25/A. and general size of prairie dogtowns. C.L. population described by V. Bailey/V.B. notes of Aug. 1892 tells of abundant C.L. about Wichita Falls and from there 51 mi. SW to Seymour in "one cantonious dogtown." They will certainly average 5 to the acre throughout this distance. "Estimated 3200 dogs/section. Along F.T.W. and Denver R.R. from Wichita Falls to the cross- ing of the Prairie Dog Fork of Red River, numerous. "This