Mayhew 1950 Cliff Swallows 21. July 19 Conaway Ranch, 2 mi. east of Woodland, Yolo Co., Calif. Approximately 100 Cliff, Tree, + Barn Swallows were seen in the tules + flying over the main ditch about 2 miles south of ranch headquarters. July 23 Bridge, 12 mi. S.E. of Dixon, Solano Co., Calif. About 40 birds of this species were seen flying over the bridge, + some birds were frightened from nests underneath the bridge. July 26 Conaway Ranch, 2 mi. east of Woodland, Yolo Co., Calif. About 300 Swallows; mostly Cliff, but some Barn, were seen on the electric wires on the north side of Willow Slough beside Lee Baldock's house. Aug. 12 Nearly 300 Swallows were again seen on the electric wires near the Baldock place. As before, the great majority are Cliff Swallows. 1951 Feb. 22 Bridges, 7 mi. west, 1 mi. north of Davis, Yolo Co., Calif. The bridge at the corner of roads 31 + 95 had about half a dozen rather complete nests at the north end, but only partial remnants remained at the south end of the bridge. (This is bridge I in my key). The bridge 1/4 mile farther west of Bridge I (this is Bridge J) had no complete nests + very few remnants of former nests. In no case was there 1/2 a nest remaining.