Koford Cynomys ludovicianus July 27, 1955 3 mi. N. Fairburn, Custer Co., S. Dak. and bare earth around, principal fort Amur. rifle ; also Dyp. pop., Kochia, Sol., Daphanella, Amur. blat. Dwindle block widow spiders with egg sacs seen mouths burrows. Apparently thick but short grass cover does not inhibit digging of burrows; they are even in rounded bottoms around (2" tall grass). Digging 4-5" deep into soil around some burrows in grass. Dead C.l. had 1000+ dung butter after carcass contents. Normal larks seen in covered area, mod- erate larkers alone lay. No reptorial birds or mammals seen, or evidence of them found. Took several sketches and photos. Examined two dead picked up. One 2, 352 t.l.-75 tail; 700 gms. Area nipples gray & thinly haired but nipples not protrude. Vulva blocks on protruded parts (4 anal area). Ut. horn 55 long, 2 mm. wide, dark pink; no conspicuous scars. Much fat measur- ing, little none external thigh. Stomach wt. 15 gms., caecum 30. Stom. contents 90% grass, including some (or most) brackles. Apparently little 1000 needed to kill. A molt line across shoulders; antlers new hair around ears, nape, muzzle back to eyes; dorsal with tail new hair, molt line across central side, down behind, poles anterior (to brisket). (Yearling? Tail not epineuris). Other 2 of year., 500 gms., measured 323-80. Vulva area slightly pregnant; nipples areas not vanish. Stom. ost. 25, caecum 60 gms. Stom. contained 40% grass, some (not?) bristles, parts of a beetle. Ut. horn 50 long x 1/4 mm. wide, modest measurement foot, no external (thigh). All look molted save crown. Belly uniform. Boreal 1/2 tail new hair. Teeth show juv. July 28, 1955 Badlands Nat'l Mon., nr. Wall, S. Dakota Talked with J. A. Buttler, Dept. since April 1953. He was interested in wildlife & knew much about it. Largest former town between Oda Pass Lodge Interior, both sides road. Mort C.l. paired about 2 yrs. ago. & some illegally by ranchers. Buttler said he did not publicize C.l. be- cause someone might poison them "again." Cattle graze on monument.