Koford 1955 Cynomys ludovicianus February 9, 1955. Ft. Collins, Colo. As to sand, he said they burrow in very sandy soil only when well sodded. Dardiet swam to him about 3 miles N. of Mastina. Largest mounds there on Tony Roman's place (Antelope Refuge, N. Laramie Co.). He had dug out no burrows. Water - C.L. Small rodents tend to be near, perhaps because grain feed, not water. Associates- only Citellus tricolor, important; probably white-footed mice & some ho-goose rats (Citellus spilozona rare). Ferrets - none seen this region (but saw, 2 foxes, Park Co., about 1947, where many other species (C. ginnicoidis ?). Coyotes, badgers, jackrabbits increasing like, Crowck said. (Larger size coyotes higher than during last 3 years). Crowck thought prairie dogs now under control but would not be eliminated entirely. Poisoning done only where complaint made. Farmers pay bait cost (varies); about 12$/A. in Weld Co. & must pay for follow-up works; other pay by A., including follow-up; much variation between counties. See Co. agents for info.). Logan county still has many prairie dogs though now being poisoned (Ft. Collins man). Crowck had no idea about what age a sex class migrated but thought new colonies started up to 3 or 4 mi. from old. We said that small colonies cautiously starting now in new areas (on L.V. project lands too). Crowck agreed to hold off poisoning on towns he was studying, if no complaint by ranchers. February 11 N. Ft. Collins, Colo. Fresh snow on ground yesterday morning but cold & partly overcast yesterday. Clear & fairly warm today (about 38°F). At 11 a.m., I observed the Spring Canyon colony and saw many out. In the E. group