Remsen, J.V. 1974 American Dipper Cinclus mexicanus Jan.25 Tilden Park, Contra Costa Co., Calif.: 1 in the artificially rocky stream bed going through the Botanical Gardens. This bird was found in early December by Joe Morlan. It may be an immature, since it is very brown-headed and its entire lower mandible is dull yellow. Bill Principe and I flushed it up the stream bed to see what it would do when it ran out of the stream, which ended (began) in a culvert under the road. The bird flew into the culvert (diameter ~ 5 ft) through to the other side of the road. Feb.3 Tilden Park: 1 at same place in Botanical Gardens. Seen with Dick Erickson, Tom Schuytenberg, Joel Greenber Feb.6 Tilden Park: 1 still at Botanical Gardens. Seen with Kim Garrett, Russell Greenberg, Barry Sauppe, Rich Stallcup. Apr.26 Boca Dam, Nevada Co., Calif.: 1 singing full song in stream above dam.