Koford Cynomy s ludovicanus March 7, 1955 Nr. Ft. Collins, Colo. At 7:50 a.m. at Spring Canyon Dam colony. Clear, calm, about 32°F. 4 warbling. Saw 3 out—but 10 by 8 a.m., 18 out at 10:20. All frogs soon after emerging. Many of these around periphery of trapped area, but 2 came out of burrow at T2, 3 frogs near T12, 3 near T16. Farthest one out of burrow about 200 yds NNE of T13; two 50 yds E of T13. Warm & clean all day. Returned at 1:30 p.m. I saw 12 frogging. Spent rest of afternoon hopping colony. Sec. 4 of this colony is property of George Ross. Ross has lived in this area 65 years. He has house about 2 miles NE of present colony. He said that formerly C.l. near his house in pasture, in Sec. 4 cattle & horses grazed. Six years ago poisoned by 1000 corn, Then a single C.l. seen a year or two later, then increased. He has had a little poisoning with strychnine grain since, but no complete coverage. About 1/2 mile to 6, is colony on property of Mrs. Brace (of Lowlard). Still many C.l. there near wheat- fields. Ross says C.l. eats darnel wheat for space of about 10 yards & digs burrows in field. [illegible] Hanson gave me a q (no. 28) that he shot 1 mile W. of Rudy Lebernans on Mar. 6. Note: Slopes measured with clinometer before this were in 0°, from Dec. 6 to 70. March 8, 1955 NW. Weld Co., Colo. Drove to Wellington colony, arriving 8:45 a.m., light breeze; 8/10 cirro stratus; warm. The farthest N. active burrow is about 100 yds. S. of feed house. Well-drained, mowed with fairly tame C.l. there (staked). Never fed here—a fairly thick stand of Kochia. I walked to near S. end colony & counted 35 within boundary fence, 10 in heavily overgrown pasture to S., & 1 just S. of fence across pasture. Because northern part colony hemmed in by thick vegetation, & a silo next to