Koford 31 Cynomys ludovicianus January 28, 1955 Nr. Loveland, Colorado Level was small lake surrounded by dikes as sometimes much larger. Saw one Cynomys ludovicianus + 2 Sylvilagus near the colony. In active part slope was about 2% to 5%; but in another part N. of dry canal some burrows were at top of a 30% slope as slope of 15% (some doubt if certainly C. L. burrows). Old burrows N. of active part, across dry canal, to W. of old buildings. I set 3 live traps near burrows when we went down but in one have got nothing (using collapsible 8" x 8" x 24" welded wire traps; Not! Live trap Co. Tamarack, Wisc. John King says there worked at Wind Cave). One dog let me walk up to a distance of 100' before going down hole. It gave rapid series chitter as I approached. I parked car 50 yds. from another. At freeze, dead & semicompletely visible to me over mounds tops, 4 remained almost motionless for about 20 min. until I walked toward it. After I set traps, I saw only 2 above ground (this not near where I had walked). I think that in winter they spend little time above ground & may stay down a long period, or the rest of the day, if alarmed. This colony deserves at least a day of work to study variety of mounds & burrow elements & relation to vegetation. I did not visit another, older, colony to north of this one (prob. also in Sec. 31, in NW ¼). // I drove then south to Carter Lake road & looked for C. L. in Delta 18+19, 2 mi. S W of Loveland-Lontrice Reservoir, where N. Merin had told me of C. L. The 3. ½ of Sec. 18 surfaced.