Roford Cynomys ludovicianus May 29,1955 Nr. Ft. Collinsj 6lo. #4, but diggings at adjacent #5 (some trapped at #4). Some mounds where no digging, sparse stand Ag. smithii scattered over mound & low ground adjacent. Bramps of jivas. seen near #18 & #25, when alarm, one adult ran 30+ yds. S. to 3 jivas. I set line traps baited with bailly at month #20. // Visited Abril "ghost town" at foot Buckhorn Canyon on W. exposure, open meadow, 5-15% slope, Bouteloua grac ilis dominant & fairly continuous, but sparse Agrop. smithii pre- sent. About 10 A. colony, Slope to set. 20% had burnow. Burn over clump together at uphilledge colony, where slope steepened above (damper?). River surround area; Cercocarpus between pines & pasture. On old mounds, rather rocky & large, most conspicuous invaders: Aritinisia frigida ; Bromus, Elymus?, tiny blue flowered pulse, fal, Amaranthus ?, a short Poa, Eucata, Cirginiun, Tropaeolum, another large compact. Collected sample minding vegetation. Not same species all mounds. No recent grazing, but dropping above old horse & cattle pasture. No New Spring Dam colony (100 yds. nearest burnow) sign of living C.L. found 4" long Pithophiis crawling. Starch empty, May 30,1955. About 9:30 a.m. visited Spring Canyon Dam colony & haunted logs. Warm but overcast. Made overlay of locations where 14 seen (not all stone; allowance for probable travel) in 3/4 hour; plus litter 3-5 jivas. Block widow spiders & webs in moitthe around burnows. One C.L. on slope 100 yds. E. of #15, at burnow; about 10-15% slope. Visited dump colony & saw 4, no jivas. One 80 yds. in from S.E end colony, another 100 yds N.W of it, & two 200 yds. farther N.W near N.W end colony, allen E. side bottom. No evidence of gathering together. Saw 1 baby Sylvilagus at burnow mouth.