Koford 1955 78 Cynomys ludovicianus March 22,1955 Denver Co., area of about 160 acres one day in October. At that time the sneches were already in dens but had come out on a sunny day. I met Ray Fugate, is charge of Predator & Rodent Control in this region, & his cost, Laury. They said that in the area east of Palmer Lake, 7500ft, an erect between Arkansas & Platte drainages, there were prairie dogs that seemed to be hybrids between the black & white [illegible]. There produced young both early (fairly well grown in May) & late (1 pregnant in Sept.) in the year. Control of them was difficult. What range condition? They thought range for in that area. Mr. Nighly owns much of land that area (former St. Lov.). Now highway, then brushland, has dogs both sides. SSW of La Joute there is an area of ghost town, said Fugate, or an I.U. project. In some counties, such as Cheyenne, no control in recent years, & little in Kiowa Co. At Extension Office in Ft. Morgan should be record of a vegetational survey made in a prairie dog area (Crowell should know of this). Most control difficulties with Gunnison & Yuma prairie- dogs. Poison now worthless in some areas or prairie could not take it (in SW Colo. especially). March 25,1955 Nr. Ft. Collins, Co/o. In afternoon visited Spring Canyon Dam colony. About 3" cold snow, temperature about 15°F. No sign of C.l. activity at any burrow. March 26,1955. Visited same colony 2:30-4 p.m. Much melt- ing of snow today, but not cool. Examined all burrows where traps had been set or where tools seen after last storm. I saw 4 C.l. out a snow at 2:30 p.m. One allowed approach to