Abstract
The adults of the known species of the Hoplopleura hesperomydis complex are described and illustrated. Three new species: H. difficilis, H. similis, H. cooki and one new subspecies: H. ferrisi emphereia are described. H. reithrodontomydis Ferris is resurrected on the basis of immature and adult stages, and the first and second nymphs are described in addition to the description of the adult. The characters of taxonomic importance and the history of the group are discussed. A key to adult stages of the known species of the complex is presented.