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THE present paper is based on field work in Lower California during parts of the years 1923, 1924 and 1925. In that time five trips were made by the writer, in the interest of the Natural History Museum, San Diego, California, into the Northern District of the peninsula. The dates of the trips, which were made from San Diego in the company of various persons, and their furthest destinations were: April 6 to 21, 1923, to Santa Catarina Landing; May 31 to June 29, 1923, to Sierra San Pedro Martir; June 26 to July 27, 1924, to Sierra Juarez; February 18 to March 3, 1925, to San Quintin; April 27 to June 29, 1925, to Aguaita. All work was done with the cordial and generous support of the Mexican Government, whose respresentative, the late Prof. Jose M. Gallegos of the Department of Estudios Biologicos, was in official charge of the second 1923 and the 1924 trips. Other coworkers in the field include Griffing Bancroft of the San Diego Society of Natural History, who financed the first 1923 trip, Clinton G. Abbott, Director of the Natural History Museum, San Diego, and Mrs. May Canfield of the San Diego Society of Natural History, whose cooperation has made these notes possible. The attached list is in no sense intended to cover all the birds of the region; it includes only those species to which some reference that seemed worthy of record was made in the field notes. On trips necessarily of such short duration, it would be several years before a comprehensive survey could be made even of the Northern District. Nevertheless, sufficient interesting observations have so far been made it would seem, to warrant, publication of the ornithological findings to date. The topography of the territory is affected by various factors which are of interest to the naturalist. In the foot-hill area, between Sierra San Pedro Martir and the Pacific Ocean, where most of the field work covered by this paper has been done, diverse influences converge. From the south there is the influence of the