Koford 1954 Cynomys ludovicianus December 10, 1954 Denver, Colorado. Talked with Robt. Niedrach, taxidermist of Denver Museum. He said no doubt Cynomys has disappeared because of poisoning in last 15 yrs. He knows of colony of about 20 near Denver. Formerly many in Weld Co. near Wyo.-Neb.-Colo. junction, Mr. Niedrach, & this might be best area to study. There has been an effort to set aside this region as a preserve. Dr. Wagner of Forestry Dept. has been active in this. Big cattle companies (especially Warren Co. of Cheyenne) oppose this. Some poisoning big reduction in eagles, ferrug. rough leg, prairie falcon, & some other raptors that nested in cliffs that region. Niedrach thinks few in Colo. 42 years (with Mum). Little fieldwork last 10 yrs. An enthusiastic & talkative. Reminded me of a tall Bert Harwell. Col. Wolff, the egg collector, has worked Niedrach area in past & could give info on raptor abundance years ago. Driving Denver to Ft. Collins via U.S. 87 highway, saw no active Cynomys sign but lumps in some fields that may be large recent old mounds of P. dogs. December 11. Mr. Fort Collins, Colo. Below foot of Spring Canyon Dam on land heavily used by cattle I saw many P.d. mounds & holes. Heard one & saw it on surface. Mound was fresh symmetrical proto, well dotted with indentations of apparent butting. There on (Sec. 33, SW 1/4) E. side road 200-400 yds. On W. uphill side road were old burrows in short grass pasture. Now appeared to have been used for months. Slight vegetation & this heavily grazed in area active burrows. Drove a football road