Mayhew 1951 Cliff Swallow 22. Feb. 22 Bridges, 7 mi. west, 1 mi. North of Davis, Yolo Co., Calif. The bridge 1/4 mile still farther west (Bridge K) contained no trace of any of the nests that were used last year. Bridge, 4 1/2 mi. west, 5 mi. north of Davis, Yolo Co., Calif. There were 7 complete nests in the extreme south-east corner of the bridge, + a few fragments of nests at other places, but the great majority of last year's nests have disappeared. (This is Bridge O in my key — 1 1/2 mi. west of county road 98 on road 27). Two bridges within 1/4 mile of the corner of roads 25 and 95 appear to offer a promise of more nests. The same is true of 2 other bridges, about 1/2 mile apart, on road 95 about 1/2 mile from north of road 27. A better prospect than any of these is a bridge on road 24, 1/2 mile west of road 93. Bridge, 4 mi. west of Davis, Yolo Co., Calif. This bridge, at the entrance to the Pierce Ranch, contained only 2 complete nests, + very few fragments of other nests. Feb. 24 Bridge, 3 mi. N.E. of Davis, Yolo Co., Calif. There were very few complete nests seen under this bridge today. Although I didn't wade under the bridge, I checked the abutments with binoculars. I saw only about a dozen complete nests, and about 25 fragmentary nests still in place.