Koford Cynomys ludovicianus June 15, 1955 Devil's Tower, Wyoming alcea, &c. small mustard (uninvaded area), a single burrow was surrounded by conspicuous area, 3' in radius, where Artemisia cana 16" high & covered about 20% ground (scarce in surrounding zone), & little Asm. mixed with it. It appeared that Art. cana increased when freed competition of Asm. on other herbs. # At NW hillslope end, uninvaded grass about 10" tall (Asm; 30%), but about 30% ground bare. No barren save scarcity of edible forbs, it seems to me. This also true on S. slope near NW extremity where uninvaded part primarily Asm., Sphaeroclea, Bromus too. // On census area #2, around ephemeral, made 3 counts at different time day, getting 14-15 grown C.l. each time. No joins. Are they in any area more than 200' from food, above & below - why? Suzanne noted same independently. On S. slope, 10% slope of food, red silt loam soil, near their Aristida, largely old & dead, but nearly pure stand. Some unused but few used burrows in the Aristida area, so apparently do poorly there the will invade on occasion. Areas of little- used mounds had good growth forbs, & these might be food for a few C.l., whose activities would open more burrows & increase forbs. // Harvest ants love small mounds; active on many C.l. mounds, apparently utilizing high spot for their nest. Astragalus canavanus invades mounds too. Viola nutt- alli invades mounds to small extent; red bed S. slope. Perhaps highest burrow density is N. of food across from census area#1, where soil red & slope near 10%. Steepest slope occupied red bed soil is 15%. Slope of most area is