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15. Institutional approval: [[signed]] Helmut K. Buecher [[/signed]] Helmut K. Buecher Head, Office of Ecology Museum of Natural History [[signed]] R S Cowan [[/signed] Richard S. Cowan Director Museum of Natural History [[signed]] Frank A. Taylor [[/signed] Frank A. Taylor Director U. S. National Museum [[signed]] Sidney R. Galler [[/signed] Sidney R. Galler Assistant Secretary (Science) Smithsonian Institution [[signed]] James Bradly acting Secretary [[/signed] ^[[for]]S. Dillon Ripley Secretary Smithsonian Institution -16-