Mayhew 1950 Cliff Swallow 2. March 11 Pierce Ranch, 4 miles west of Davis, Yolo Co., Calif. There are 35 nests in good repair, in addition to 2 Barn Swallow nests. There are 23 nests that have been damaged, but might be repaired. Several of the birds flew up into some of the nests that were in good repair. March 12 Poleline Bridge, 3 miles northeast of Davis, Yolo Co., Calif. One bird was flying above the bridge when I arrived this morning at 11:30 AM. The wind was blowing very hard from the north. While I was marking nests under the bridge, 6 birds came and flew around the bridge for a few minutes. When I returned to the south bank, 2 of the birds flew to 2 adjoining nests (3-3 + 3-4). The bird at nest 3-3 flew away in about 10 seconds, but the bird that hung at the opening of 3-4 went inside and remained there for the few minutes that I remained in the area. Bridge on Road 32, 4 mi. west of Davis, Yolo Co., Calif. When I arrived at the bridge this afternoon no birds were in sight. I was there about an hour, during which time 10 birds arrived on the scene. March 13 Poleline Bridge, 3 miles northeast of Davis, Yolo Co., Calif. The following chart is the arrangement of nests under this bridge on this date. Each nest is given 2 numbers; 1 for the section of bridge, 1 for the nest. Nests shown like this are damaged nests.