New York: Scribner's Sons, 1908. First edition. Hornaday was a wildlife conservation movement pioneer and first director of what is now known as the Bronx Zoo. Covers his explorations of the volcanic Pinacate Peaks in Mexico and along the Arizona border and environs. 8vo gilt-stamped red cloth boards with photographic plate; top edge gilt; 366 pages including index plus 4 pages of ads. Illustrated with photographs including a few in color and two full-page maps by Godfrey Sykes: “The Sonoran Desert Region Between Tucson and the Gulf of California” and “The Pinacate Region, North-western Sonora, Mexico,” the latter of which is the first ever of that region according to the author. Bookplate on pastedown. Bright and near fine.