Roford 286 Cynomys ludovicianus September 28,1955 TRNMP, Medora, S.Dak. of road (when most green food). || As live Cynomys tamm in N. side Highway between a few miles W. of Belfield; another a few miles S. of Belfield to E. of highway 65. Both in gentle short grass slopes.|| Clear day with mod. breeze. Drove 6. to near Ludlow S.Dak. to Ralph Jocobi ranch to see allivio prairie dogs. There was in colony about 1/4 mile long (E+W) +1/4 mile wide (N+S, N. exposure) on 5% slope where Bunkler d. dominant. Ground cover 40-60%. About 20 white prairie dogs, some whiter than other, scattered thin colony, but about 1/3 in E. 1/5 of area. Ralph Jocobi says they nearly all allivio in E. half in early in summer. They had shot many but generally not the white area (one shot, looks not quite pure white; eyes pink; says R.J.). Areas of many green yards of short dry Bda cut at base, as at TRNMP. Forbs + brownie little. Opuntia, Art. frug., Euph. (Geyeri?), Cheno. bypts., Spharangy - Trees all. Sol. triflorum - green, 4 usually on C.l. mds. Asm scattering <1%. Many shallow diggings in area Afa, 4 even in Bda turf. At S. edge some Art. cana, 4 some cut (apparently by C.L.). Many bones darker. No coyote scats found. One group 5 lodge bug burrows (recent) prominent. A jirv. was shot. 345-78- 65 measurements. Tister 6 x 4 mm., old. Serotum no pigment. Tails more freshly molted. Caecum 80 gms., stomach 30+ (saved for exam.). Much fat (5 mm. on thigh). Another similar jirv. 7 shot. 700+ gms. Some fleas. Evidently prime large + fat. || Pop. density max. 12/A, but are. about 4. Fairly uniform area - no prominent swales - but foot, at stream bed end, dropped 10' down sloping bank to bench, where some burrows. appr. antly used adjacent land similar, + suitable for C.l. spp.