Endangered and Threatened Wildlife and Plants; Determination of Endangered Species Status for Mount Charleston Blue Butterfly

We, the U.S. Fish and Wildlife Service (Service), determine endangered species status under the Endangered Species Act of 1973, as amended (Act), for the Mount Charleston blue butterfly (Plebejus shasta charlestonensis), a butterfly subspecies from the Spring Mountains, Clark County, Nevada. The effect of this regulation will be to add this subspecies to the List of Endangered and Threatened Wildlife. Based on information gathered from peer reviewers and the public during the comment period, we have determined that it is prudent to designate critical habitat for the Mount Charleston blue butterfly. Therefore, we will publish in a separate Federal Register notice, our proposed designation of critical habitat for the Mount Charleston blue butterfly.