S. oberholseri new. Recessional after agava, resembling it externally, but with size, margin, and teeth of coryi. 220. Southwest Bay, New Providence, near the landing. I name this recessional species in honor of Mr. Harry C. Oberholser of the United States Biological Survey, Washington, D.C., who, through his keen analytical studies, has discovered many cases of the effects of cyclic recession in birds, and whose philosophical conclusions, derived from those studies, point clearly toward the dawn of a New Ornithology.