Koford 319 Cynomys ludovicianus November 8, 1955 USNM Washington D.C. Nov. 1907. // S.G. Jennett noted them abundant near Arvada, Wyo., in Aug. 1913. // Cary, 1909, found nearly exterminated in Ft. Laramie - Lusk region. // V. Bailey apparently estimated number dogs by number burrows, even in 1913. Estim. ates of ave. nor. by Bailey workers rarely over 12 dogs per acre, 4 many Bailey estimates only 2-3/A. // Math Debate has relatively few records C.L.; Jennett, 4 R. Kelly (1915) maintain notes. // Kansas: D.E. Lanty noted formerly abundant, mostly destroyed by 1905. // V. Bailey in control with Teton, San-Angels region, in 1892 & again 1918 - only about 10% of prairie dogs at latter date as former; copied some of his notes in USNM files on this subject. Ft. Collins Colorado November 16, 1955. At 2 p.m. visited Spring Canyon Dam colony. Around morning of Nov. 11, 4 cold & were snow some. No new snow since from Nov. 15, 4 about 1" fresh light snow still on ground - excellent for observing tracks. Many rabbit & dog tracks present, 4 a few mice, but only 1 burrow found with apparent C.L. tracks near - there there went no more than 3' distant from hole (#10). Apparently almost no activity above ground today or yesterday at least, 4 below freezing throughout both of these days. November 29, 1955 Visited Spring Canyon Dam colony about 2 p.m. No snow now on ground there. Counted 24 C.L. & made overlay map of location. Areas occupied same as in summer, no extension both