Koford 1955 60 Cynomys ludovicianus March 1, 1955. Mr. Ft. Collins, Colo. others out at 2:30 p.m. Several burrows with traps showed little or no activity (as 16, 17, 19, 15 18, 6, 11, 2), the muddy entrances so tooche should show. Set one new traps (#18). Least snow on ground since a few days after Christmas at Ft. Collins. Trap 4 has now taken 2707, 292. March 2, 1955 at Spring Canyon Dam colony about 2:30 p.m. found 3 in steel traps. #21 in Trops 12, #22 in Trops 8, or 23 in Trops 14. Three other traps were sprung; trap 4 had a fur tip in it. Two caught mice had gone around in circle on- round drag and then drawn themselves tight to drag. One had dragged 2 lb. stick about 20 feet up gentle slope. All had 10+ fleas. Some yesterday had 30+ fleas. Only in this recent warm spell have been insects in burrows - 1 fly, 1 cricket. When approached, trapped one lies very quiet, eyes open, belly close to ground, but breathing visible. Some of the area in this colony has fairly continuous carpet of very shot dry grass. The area of one cynomys runway, about 5" wide, has no litter and mainly rootstoke & base stubs of Buchholz, these covering only about 20% of soil surface. March 3, 1955 Drove to colony at 6450 ft elev. at foot of Buchanan Canyon (W. of Mosville), A N-facing gorse slope had old colony. Nearly all burrows now filled in but mounds many and large. Most of large mounds 9' diam., 4-12" thick at center. Soil appears to be merely gravel on surface of mounds, due to wind erosion, but one can dig into easily with fingers - a fine loam with gravel to about 1" diameter. About 37% snow cover on ground. On old mounds, some had mainly Artenisia frag-