Koford Cynomys ludovicianus July 16, 1955 Devil's Tower, Wyo. I saw 2 catty heads of green but drying Bromus tectorum, at some site where brome much trampled down to ca 5 yd. radius around burrow. // At NW edge colony I had put stake at limit apparent activity last march. Now there was a few new burrows to WSW of that downslope, to 80 yds. distant, apparently new invasion. Burrow area has about 50% bare ground (vertical view), but many good forage grasses, & some water erosion (one burrow near head of gully). Plants at site farthest burrow: Stipa comata, Andropogon scoparius, Agropyron smithii, Bromus tectorum, Aristida longiseta, Asclepias pumila, 1 yucca, 2 Opuntia polyacantha, Agropyron, pheasant, Artemisia frigida, & some others. This soil 3' drain, 6