Koford 136 Cynomys ludovicianus June 12, 1955 Devil's Tower, Wyo, but not notably large. Top layer of soil probably more clay than deep. River banks above alluvial soil few deep with little rock. A few burrows near oak trees; one 1' from 4" deep. Trunk of 9' high tree. Artemisia brush 3' tall had many 3/4" diam. branches cut (by e. l.? ). At edges are mound, much Art., frigida about 8" tall; about 15% of stems cut. On SE slope above road, gopher mounds & casts of burrows in snow. On this slope, few burrows when Aristida dominant, none when Andropogon dominant. I found 2 shells Procyon near edge about 2 Agre town near river. Stohelott on area next to road, 74A 546 84 207 estimated. Counted 254 27 e. l. (no joins) about 7 p.m., (fewer lots), 4p. 33 at 5:45 (a few joins, included). Few givs, out. No large litters (>3) seen. Overcast all day but mostly clear 5-7 p.m. Took $130 for expedition. June 13, 1955 Commenced mapping Cynomys colony outline. Limits very close to those mapped by James Cole in Sept. 1947, especially considering methods used (plane table & stadia) & differences in estimate limits. Yet burrows in pinyon wood occupied. Possibly SE sect has smaller population than before. This has been an exceptionally wet spring, overcast most of time for about 3 weeks & often rainy. Fine growth forb obscures bare soil on many old mounds. Little grass apparent in day town except where Aristida longisetosus common. Some Agropyron smithii, Büchler, & Poa trivialis gracilis present. SCS man, Dörlason, from Kulett, said he would consider pasture conditions on day town "poor," all gone to waste. I saw many givs. out today; warmer & sunnier than