Endangered and Threatened Wildlife and Plants; Designation of Critical Habitat for the Peck's Cave Amphipod, Comal Springs Dryopid Beetle, and Comal Springs Riffle Beetle

We, the U.S. Fish and Wildlife Service (Service), are designating critical habitat for the Peck's cave amphipod (Stygobromus pecki), Comal Springs dryopid beetle (Stygoparnus comalensis), and Comal Springs riffle beetle (Heterelmis comalensis) in areas of occupied, spring-related aquatic habitat in Texas under the Endangered Species Act of 1973, as amended (Act). The three listed species are known only from four spring systems in central Texas: Comal Springs and Hueco Springs in Comal County, and Fern Bank Springs and San Marcos Springs in Hays County. The total area designated as critical habitat for the amphipod is about 38.5 acres (ac) (15.6 hectares (ha)), for the dryopid beetle it is about 39.5 ac (16.0 ha), and for the riffle beetle it is about 30.3 ac (12.3 ha).