Hyla ranki, sp. n., is described from the state of Minas Gerais, southeastern Brazil. This new species resembles Hyla rizibilis Bokermann, 1964. The advertising call and the tadpole are also described. Observations on the biology of the new species are referred and the recognition of the group rizibilis, constituted by H. rizibilis and H. ranki, sp. n., is proposed. Hyla mirim B. Lutz, 1972 is synonymized with H. rizibilis.