Koford 1955 Cynomys ludovicianus January 13, 1955 Mr. Pierce, Weld Co., Colo. the very active colony that Lee Dans (Thiria, Colo. A.T.M.) need for conserving cottontail. I saw a cottontail & many rabbit tracks (nearly dark) in passing. January 15, 1955 Laramie, Wyoming Talked with Reed W. Fautri, Goal. Dept., Univ. of Wyoming & told him of my plans for study of Cynomys ecology. He seemed to think I was on the right track & offered to visit my study areas with me later in the years. He gave me assurance that I was in a good spot for study as predator & rodent control very rigorous in Wyoming because of pressure of sheepmen. In Wyo, only Cynomys leucurus in Laramie area, but probably C. ludovicianus near Cheyenne & eastern (Lovel) part Wyoming. No recent survey C. L. made in state previd so limited distrib. unknown. We thought temperature re- productive success in different sized colonies would be good angle. Relation with herbage, soil, & water (in soil) important. I was gratified to get assurance that I was working along a reasonable line. Really got no new ideas. January 18, 1955 (Weld Co.) Briggsdale, Colo. Jenkins, postmaster, has own planes. He sometimes sees C. L. towns from air. He told me of one 3 mi. W. 2 S. of Briggsdale (E. of Silver House) where he saw some last summer. J., seemed intelligent & interested in my work. Talked with W. E. Williamson, in charge of Land Utilization project. He had been here less than a year. He told me of approximate location of 3 C. L. towns, two prob-