. [Collectés les réimpressions, 1911-1931. L'ornithologie, les mammifères. Septembre, 1924 183 LA MIGRATION D'AUTOMNE NOTES DE LA RÉGION DES MONTAGNES DE SAN FRANCISCO, Arizona (avec deux photos) Par HARRY S. SWARTH (No 424, du musée de zoologie des vertébrés^ de de l'Université de Californie) au cours de l'automne 1922, l'auteur a passé deux mois dans les activités de terrain dans les environs de San Francisco Mountain, Arizona. Ce travail a été mené en collaboration avec le Dr Francis B. Sumner, de la Scripps Institution de recherche biologique, et son adjoint, M. Ralph R. Huestis. Les frais du voyage ont été prises en charge en

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. [Collected reprints, 1911-1931. Ornithology; Mammals. Sept., 1924 183 FALL MIGRATION NOTES FROM THE SAN FRANCISCO MOUNTAIN REGION, ARIZONA (with two photos) By HARRY S. SWARTH (Contribution No. 424, from tlie Museum of Vertebrate Zoology of the University of California) DURING the fall of 1922 the present writer spent two months in field work in the vicinity of San Francisco Mountain, Arizona. This work was conducted in conjunction with Dr. Francis B. Sumner, of the Scripps Institution for Biological Research, and his assistant, Mr. Ralph R. Huestis. The expenses of the trip were defrayed in part by Mr. E. W. Scripps, through the Scripps Institution, in part by Miss Annie M. Alexander, through the Museum of Vertebrate Zoology. Dr. Sumner was in charge of the expedition, the main object of which was a study of certain small rodents of the region explored. (See "The supposed effect of the color tone of the background upon the coat color of mammals, " by F. B. Sumner and. Fig. 47. Dove Tank, near Deadman Plat; artificial storage of surface water in A region with few permanent springs and streams. Photographed October 11, 1922. H. S. Swarth, Journal of Mammalogy, vol. 5, May, 1924.) Mammal collecting took up all of the time of Dr. Sumner and Mr. Huestis, and a large portion of my own. I did give some time to birds, however, keeping notes on all species observed, and, especially in the latter part of our stay, collecting specimens of many of the species. Most of the mammals and all of the birds I collected, together with field notes and photographs, are in the Museum of Vertebrate Zoology. The following notes are presented mainly for their value as statements of occurrence. Our time in the field covered most of the period in the fall when birds were actively migrating, and in many cases I was able to ascertain exact dates of arrival and departure. I believe there have been few observations of the sort from this section.. Please note that these images are extra

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