Koford 1455 Cynomys ludovicianus March 13 1955. Nr. Ft. Collins, Colo. Itty apparent for long; 7 37 in trap 25, set March 11; 7 30 in trap 8, but had pulled stick frog to a burrow 25 yds. to N. 4 was in this one. In burrow caught by hindfoot, they give very strong resistance to being pulled out - perhaps 15-20 lbs. resistance. One full with dissected decorated leaf now about ½" high, seen several sites (Cogs wellia = Zlomabium ovinbrai) March 14, 1955. Visited same colony 10-11 a.m. Saw 6 out + 2 in traps. 7 39 in trap 9, 7 40 in trap 11. 7 39 had impref. nukea; probably spaying; 7 40 recent or near ovulateri. Fresh digging at edge mound area seen - about 2" deeps. No (sign) green vegetation in hole. A ½" high fall sprout next to hole not taken. A few flies seen near holes. Clear warm day with mod. wind. Cold 4 overcast in afternoon; light snow evening. March 16, 1955. Visited same colony 12 m. to 2 p.m. Snow 2" deep save. Saw 3 out in area 50 yds. SW of trap 15. I searched colony 4 put stoles dug burrows (about 15) where there were tracks. No tracks near burrow when the 20 traps set, N. of fence, tracks at only one burrow (30 yds. NE of trap 8). In area SW of trap 15, 6 burrows connected by (Caryoditeiria) sandra; one food trocha. Some trocha to Chrypothernius stely, roches, 4 saw dung then being dark objects sticking out of snow. Apparently some nibbling at woody Chyseos stems 4 at dung, Digging near burrows from 1" to 4" deeps, 4 at bottom stubs of white roots ½" diam. In vicinity trap 26 4 ½ N., two burrows 30 yds. apart connected by 6+ sets trocha in fairly derisit path. Near trap 25, trocha went 30 yds. out on E. & W. side of a central burrow, but a hole about 5 yds. from eastern limit trocha. In same area me