Roford Cynomys ludovicianus July 16, 1955 Devil's Tower, Wyo. Even in rather thick Cattaniun cristata, used 4 old burrows ds., with falso, at distance to 20 yds. from other burrows. The 2-3' high mustard (Brassica herta ?) is much cut by C. L., all of it cut in same areas, mostly just felled with top lying on ground; but sometimes top missing (eater?). In area 100 sq. ft., 20 may be cut down, 4 now over 1' high left where many C. L. This is now most conspicuous weed felled. I saw one eating dry plant of a mustard with Osteopod transparent thin pods. Another apparently ate Amaranthus gra- jinus that grew next to mound (green). At E. and salary must cutting at top steep slope band dropping 10 (vertical) to stream near river, 4 C. L. have heavily cut Symphoricarpos occident- alis (1-2' tall) here, a patch of Antennia graphebola also cut (8'x8'), all cut, 12-16" tall, about 4 cut/sq. ft., only upright (it stalks cut (not cut to eat?). Brassica cuts so high as 1' above ground. Shortly a lull in no. dogs down ground in midday (dry mod. wind), 4 more about 4:30 p.m. Some C. L. bodies seen - apparently killed on road. Fed C. L. near road very fat now. Some jivs can be hand fed, but generally more wary than adults. More than 4 jivs. saw any one spot. Critter colony area occup- ied; the probably thin in areas Cristata thick. This especially thick (Cattaniun red) in area between logging road+ river in NE 1/2 colony, & above road in NW part colony. In between, in census area especially, mostly Buckles in rice shot lawn with few falso (eventual vegetation ?). These Buckles and Tom up to bare ground near many burrows.