Rostova 1942 Allen's Hummingbird (Anna's Hummingbird) March 21 U.C. Campus, Berkeley, Alameda Co., Calif. 11:00 AM to Noon. Near NW corner of the M.V.Z. watched a ? Allen's Hummer come to a young (10') Horse Chestnut tree (Aesculus hippocastanum) and probe around the new shoots which were just coming out. At first I thought she was after insects and after she flew off I went to the tree to look for aphids on the shoots. I saw none and then thought she might have been after the cufous woolly material which covers the new stems and petioles. In a few minutes she was gack and I watched her closely while she gathered a small ball of this material and flew off with it. I tried to follow her but she disappeared in the Eucalyptus grove to the west. She repeated this two or three times more, and once while I was watching a ? Anna's Hummer came to the tree and also collected a ball of this material and flew off to the WSW to a Calif. Laurel tree. This was undoubtedly used for nesting material