Endangered and Threatened Wildlife and Plants; Listing of the Miami Blue Butterfly as Endangered Throughout Its Range; Listing of the Cassius Blue, Ceraunus Blue, and Nickerbean Blue Butterflies as Threatened Due to Similarity of Appearance to the Miami Blue Butterfly in Coastal South and Central Florida

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We, the Fish and Wildlife Service (Service), are listing the Miami blue butterfly (Cyclargus thomasi bethunebakeri), as endangered under the Endangered Species Act of 1973, as amended (Act). We have determined that designation of critical habitat for the Miami blue butterfly is not prudent at this time. We also are listing the cassius blue butterfly (Leptotes cassius theonus), ceraunus blue butterfly (Hemiargus ceraunus antibubastus), and nickerbean blue butterfly (Cyclargus ammon) as threatened due to similarity of appearance to the Miami blue in coastal south and central Florida, and establishing a special rule under section 4(d) of the Act for these three species.