Roford 1955 Cynomys ludovicianus April 19, 1955 Nr. Ft. Collins, Colo. male (Photod burrow; Ohter. 35 mm.). April 19, 1955. at 9 a.m. tole up the 5 traps, One C.l., ♀ 64 (not pregnant) in trap on mound 50'N. of # 7. Wind 30 m.p.h., 4/10 overcast. Very heavy wind today. NE Larimer Co., Colo. April 20, 1955. 3/10 overcast, E mild, mod. wind. Arrived at colony in horse pasture 2 mi. E. Wellington 9 a.m. Saw C.l., Citellus 13-liniate, Speroligts a colony. Burrow #6 had 2 Speroligts, as seen on last visit. At least 5 burrows now used by cula (Another in presence near burrow of "Charlie"). Four Cercer own Trypha but pay no attention to C.l. Saw Citellus 13-liniate at 3 feet in horse pasture. Three go into C.l. burrow that apparently have no C.l., in mouths partly filled. Four brown perched on fence at N. edge of colony. These flew over a prairie dog at 15' alt. I caused it to run to its burrow (Larson C.l., a occasion?). I spent part of the day in mapping this colony. Little invasion of Distichlis when their, altho a few burrows there (not underground?). //In date afternoon visited C.P.E. colony, Set 10 live traps & 2 steel traps. Noted 5" diggings about 5" deep that cabled later the elonged into burrows. Several old burrows apparently opened up somewhat in recent weeks but perhaps not used since April. [Pro-con problem in few hours] or webo even months same - so all burrows not now used. Russian thistle detritus in, another, a green grass a fal growing at mouth (indicating no recent size). New green grass difficult to find. Frankly eaten Opuntia leafstem. Apparently still dry has & little new food available. //Topped a ♀ in Wellington presence (#63). Molting along with fins. Especially voriferous when banded-snaked loudly. Anal glands protruded farther than ever