Koford 39 Cynomys ludovicianus Feb. 1, 1955 Custer, S. Dakota in grain. Cut down much. Sometimes antelope to subside burn our 100 yds. out in ploughed field when no way, Barnes thought no rodent presence to range here. He mentioned, how- ever, that C. l. in planted wheatgrass could keep clear only the area around burrows. May dig in shale, B. said. Feb. 2, 1955. Talked with Archie Howe, the fifth F.A.W. service trapper, who has been here since 1921. He seemed less observant but than Barnes's man liable to interpret say what he had heard C. l., but not talithaic or exagynetric. He thought Pine Ridge area or White River country had always had many C. l. Area from Ogallala (spill?) to Cheyenne River once covered with. He said in gumbos soil area more. When asked about sand, said not in. Migration—he said he ran over an about 5 miles from a known town (heard of one 2.5 mi. from a town). He told of one town about 50 yds. down, that seemed to get no larger (Pine Ridge area). Barnes had worked controlling rodents at that Indian Reservation, last 3 summers. Poisoning was paid for by ranchers for fruit treatment, at a rate of about 19¢/A. Retreatment paid for by county, along one road C. l. for 5 miles, said Barnes. // At Wind Cave N.P., Ranger Auter (since 1931 but 9 yrs absence) showed us (V.B. Schoffer 42) some prairie dog towns, and told us what he could about them. The Shuttail Canyon town is said to be at W. end. We found much grass or areas said by bats to be inhabited for 10 or 15 yrs. Some of this a flat grasses with buffalo-grass-like (but softer) turf with few burrows in it. Most denuded part was on a red soil slope on N.E. side town; this apparently