Endangered and Threatened Wildlife and Plants; 12-Month Finding on a Petition To List the Northern Mexican Gartersnake (Thamnophis eques megalops) as Threatened or Endangered With Critical Habitat

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We, the U.S. Fish and Wildlife Service (Service), announce a 12-month finding on a petition to list the northern Mexican gartersnake (Thamnophis eques megalops) as threatened or endangered with critical habitat under the Endangered Species Act of 1973, as amended (Act). The petitioners provided three listing scenarios for consideration by the Service: (1) Listing the United States population as a Distinct Population Segment (DPS); (2) listing Thamnophis eques megalops throughout its range in the United States and Mexico based on its rangewide status; or (3) listing Thamnophis eques megalops throughout its range in the United States and Mexico based on its status in the United States. After thorough analysis and review of all available scientific and commercial information, we find that listing of the subspecies, under any of the three scenarios, is not warranted. Of the three listing scenarios specified above, we found scenario two provided the most rigorous evaluation of the status of the northern Mexican gartersnake and herein provide detailed discussion of our conclusions in that context. We also provide additional discussion of our evaluation of scenarios (1) listing the United