PROCEEDINGS OF THE CALIFORNIA ACADEMY OF SCIENCES r-Fourth Series Vol. XV, No. 11, pp. 279-322 May 20, 1926 XI EXPEDITION TO THE REVILLAGIGEDO ISLANDS, MEXICO, IN 1925, VI THE BIRDS AND MAMMALS^ BY M. E. McLELLAN Assistant Curator, Department of Ornithology and Mammalogy In pursuance of its long established policy of studying the fauna and flora of Lower California and the adjacent islands, the California Academy of Sciences despatched its expedition to the Revillagigedo" and Tres Marias islands in 1925. The United States government placed the mine-sweeper Ortolan at the disposal of the Academy for this purpose, and, under the leadership of Dr. G. Dallas Hanna, the expedition sailed from the Mare Island Navy Yard on April 16. Clarion Island, the outermost of the Revillagigedo Islands, was reached on the morning of April 26, and the six succeed-ing days were devoted to securing a representative collection of land and sea birds. The natural barriers furnished by masses of Opuntia and dense growths of vines made traveling • This paper is No. 6 of the Revillagigedo Islands Expedition of 1925. Previous papers dealing with the scientific results of that expedition are to be found in preceding papers of Vol. XV of these Proceedings, No. 1, pp. 1-113, being the General Report with itinerary. ^ A note on the previous scientific expeditions which had visited this group was published by the author in Science, n. s., Vol. 62, No. 1599, pp. 171-173. May 20, 1926
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