Ko ford 168 218 Cynomys ludovicianus August 12, 1955 Nr. Ft. Collins, Colo. 17 dogs from N. end. There in 1/4t 2's, well settled, most lying near edges swaler, Occupied area extends 5. over low crest + about 200 yds. beyond, the recent activity only 150 yds., if there 100 yds. to W. Unoccupied area part of old colony, where principal cover Bda. Summer burrows; many old reopened. Slopes 5-10 %. W.-facing slope to S. of next fence line ground, Aristida, & Asm., then invaded opposite slope, but old mound there. // Euph. marg. present same sites & mounds. A single plant 1' tall on recent mound, but not cut. Much in swaler to N. of E.-W. fence, but the adjacent green Shea (Salicola) cut. not cut. A single Cleane 4' tall also present. Near one burrow, recent construction mound has torn up 6'x3' area of Bda., grass being tossed on mound. Around one burrow, a low dug out area accumulated water, apparently; Asm. much in- croared when Bda absent here. // By step-loop method I paced area between burrows around south to S. of E.-W. fence, in area of most burrows. Results, for 200 vegetation plots: Bdas 166, Bgrs 21, Shea 5, Asm 2, Ses 2, Others 4; Lare 79 (=28%). E. slope higher gross density than W. slope. Bgrs more on slopes, paste, Bda more on bottom swale, Asm dry now. Others present: Osuntia, Prashe ten., Sphaeroloba, Euph. marg., Applop., Brown, Babia, Lactueneja. Overlay map made showing location dogs & limits region. Most Bgrs seed stalk setting now dry. Fresh Salicola cut down. Nearly white original area in rear + extension to S. (what age class there?). This afternoon probably took place in June or July. No signs of Carnivores, but (Butter seem over colony.) Harmer G. Arrived Dec. 23 (Rudy Ochman's) 9 a.m. Clear, calm, warm. Saw