Koford 127. Cynomys ludovicianus May 23, 1955 TRNMP, Medora, S. Dakota. prominent. In another town on Badt Creek was partly on perls land, also paired Aug. 1952. Little grazing on perly, much other side of fence. On grazed side, old mounds with much of a mustard, an Amaranthus (?), a horsetail fall. Posture a mod. stand Agro. smithii, Little litter a Bartolena. On park area, mod. slope, Agro. smithii invading edges old mounds, but surrounding posture mostly Bartolena. Also on mounds Salsola (new green, & old), & a Thyspodium? Convulvulus, & Plantago purshia. Some mounds much Sphaerolea all over. Some Vicia sativus in harsh ground. Plante a C.l. mounds mostly invading annual false, the Agro. smithii coming up around edges. One mound in pasture area, much Stipa cauda around edge and. (slope). When sod scratched out around mounds, now Sphaerolea, Act. frigida, Salsola, bare ground - much still lion, with slight litter. (Slight cover colony; a brown alga in flakes of cherts, not dry, common on ground. As N. of Wellington? wovely?) May 29, 1955. Rain on & off all day, but many C.l. foraging under complete overcast when cold & raining lightly. 12 live traps left at all night look nothing. Examined specimens. A g taken in very thinly populated Paddock Creek town had scars & ovaries indicating that a litter of 0 had been produced. May 25, 1955 I briefly looked at East Entrance town in with H2O rain. Ground saturated at one hour ended and man road. At E. edge, taller grass started rather abruptly. Uninvolved area had fairly even cover of Agropyron smithii 8'-12" tall, Sphaerolea, with a few patches Bartolena widely spaced, & some Sphaleria. My estimate is that the dog population has never increased so greatly due or to greatly modify peripheral habitat, so town has not increased in size. Probably