Koford 327 Cynomys ludovicianus December 22, 1955 Ft. Collins, Colo. side of CPER irregular, 11 Colony in Sec. 22 surely there spring of '52, may have started '51. Only invasions occurring recent years were in 1951. In late summer, about Aug., one dog found in Sec. 7, with 3 lummus at edge of a bottom. This one shot, a large ? (as large as foot first thought pregnant). Another dog found in Sec. 154, Shot. Same time. Both apparently single or more than after shot. Also at edge sunk on bottom. Both these dogs were in light use pastures. December 23, 1955 Warm again but strong wind from west, + most much dust blowing on plains. Visited (Trop #18) traps at Spring Canyon Dam colony. One Sylvilagus in trap but no Cynomys (11 a.m.), nor fresh sign. Many traps semi- coured by wind. Perhaps aircraft + wind unfavorable to activity more than cold is. Left 15 traps set. Wind diminished midday. I visited Wellington, presence town+ saw none out, no any sure fresh signs. Near my spot brows three lummus dug out, as if lay lodge, + two other 50 to 100 yds distant. Digging within past few weeks + some very recent. I took photo of my sphenome. Striking contrast inside with outside. On- Cryptantha (?) side much growth Cricogamus, Kochia, etc., sweet, but only short fobs or bare ground outside. I have much of effect probably due to protective effect of chicken wire - protects from wind, causes plant to accumulate to on ground in sphenome. Any small sphenome is found to give indiscernible picture in area where wind