We, the U.S. Fish and Wildlife Service, propose to list 21 plant and animal species from the Mariana Islands (the U.S. Territory of Guam and the U.S. Commonwealth of the Northern Mariana Islands) as endangered species under the Endangered Species Act of 1973, as amended. We also propose to list two plant species from the Mariana Islands in the U.S. Territory of Guam and the U.S. Commonwealth of the Northern Mariana Islands as threatened species under the Act. If we finalize this rule as proposed, it would extend the Act's protections to these 23 species. The effect of this regulation will be to add these 23 species to the Federal Lists of Endangered and Threatened Wildlife and Plants.