Koford 1955 69 Cynomy s ludovicianus March 9, 1955 NW. Weld Co., Colo. at about 11 a.m. when I was checking traps. Traps - ran after spring but bait entirely gone from 5+ (miles ?), very dry air & wind increasing. Left loc. 22 colony, 11:45 a.m. || 12:15-1:30, visited old colony 6 mile SE off & CPER Nolting Dr. Sec. 243, T 9N, R 65W. Crouch had poisoned there 2 years. I found no active burrows. Old burrows scattered about 1/2 mile along a very shallow draw - 4 1/4 mile upslope a larger tributary. On both sides of 25-50 yds. wide bottom, when blue grama & Sphenothamnus (to 1 ft. high) thicker & land flat across valley (gently slope downsloping age). Up slopes to about 10% slope. Soil rather sandy, rather than claylike, with little rock (reason for going no farther up slopes?). Few burrows more than 100 yds. up slopes; most within 50 yds. edge better. More than half old burrows apparently made by rabbits, especially Lepus townsendi, judging by digging (larger chamber than C.L. diga) and dropping. Rabbits keep old burrows open! Some eroded leaving central chimney of pocket soil & bone grass. This low consistency of poor brick mortar of fine sand - not easily broken. At each burrow an area 2 to 5 ft. in diam. when stubs of old grass lifted but no growth forbs (rare exception). Aristida longiseta present but not near C.L. wounds especially. It is common next to old apparent Pogonopyrum wounds burrows (as photos). Lepus diggings could be sometimes mistaken for Tadidae diggings, but a few (4) seem fairly surely old Tadidae work, there in one small area. Spacing of burrows wide - 50 yards or so apart sometimes; many about 30 yds. apart. For apart = ? - new colony? sparse food? Wellslope irregularly not filled with yellowish area where Brachylophus prominent (aedesotale to 1 ft. high); left Brachylepas common. Buttons were solid yellowish in aspect. Trace then to "ghost town" Hector Sec. 354 36, T 10N, R 65W., where Crouch