Endangered and Threatened Species: Island Marble Butterfly and Designation of Critical Habitat

We, the U.S. Fish and Wildlife Service (Service), determine endangered species status under the Endangered Species Act of 1973 (Act), as amended, for the island marble butterfly (Euchloe ausonides insulanus) and designate critical habitat. In total, approximately 812 acres (329 hectares) on the south end of San Juan Island, San Juan County, Washington, fall within the boundaries of the critical habitat designation.