Three new species of the genus Adelophryne (Amphibia: Anura: Leptodactylidae) from northeastern Brazil, with remarks on the other species of the genus M.S. Hoogmoed, D.M. Borges & P. Cascou Hoogmoed, M.S., D.M. Borges & P. Cascon. Three new species of the genus Adelophryne (Amphibia: Anura: Leptodactylidae) from northeastern Brazil, with remarks on the other species of the genus. Zool. Med. Leiden 68 (24), 15.xii.1994: 271-300, figs. 1-18. —ISSN 0024-0672. Marinus S. Hoogmoed, Nationaal Natuurhistorisch Museum, Postbus 9517, 2300 R A Leiden, The Netherlands. Diva Maria Borges & Paulo Cascon, Depto. Biologia, Universidad Federal do Ceará, Caixa Postal 52856, CEP 60 151-970, Fortaleza, Ceará, Brazil. Key words: Adelophryne; South America; Brazil; Atlantic forest; new species. In the present paper three new species of the genus Adelophryne from the coastal Atlantic forest in Bra- zil are described. The species are separated from the two species formerly known from the Amazon forest by caatinga vegetation and a distance of at least 1600 km. A. pachydactylus from Bahia has a reduced number of phalanges in the fourth finger, and large subdigital pads under fingers and toes. A. baturitensis has distinct subarticular tubercles under the toes and a relatively large size. A. marangu- apensis has large discs on fingers and toes and is boldly patterned. During fieldwork in Amapá two specimens of A. gutturosa were collected and based on them addi- tional data are provided and some concepts from the original description are revised. Literature data on this genus are incorporated and a key to the known species is provided. Introduction The genus Adelophryne was recognized and named by Hoogmoed & Lescure (1984) to accommodate some minute leptodactylid frogs from the Amazon area. Since its description few additional specimens were reported (Ayarzaguena, 1985; Lynch, 1986) in the literature. Fieldwork by the authors in both the Amazon area (Hoogmoed in col- laboration with T.C.S. de Avila-Pires), in Bahia (Hoogmoed) and in Ceará (Borges and Cascon) yielded several new specimens, partly in large series. When subjected to closer study the material turned out to contain three new species and additional material of Adelophryne gutturosa. The new species are here described and additional data on A. gutturosa are provided. Acronyms used in the lists of material have the following signification: UFC = herpetological collection of the Universidad Federal do Ceará, Fortaleza, Brazil; MPEG = Museu Paraense Emilio Goeldi, Belém, Brazil; RMNH = Nationaal Natuur- historisch Museum (formerly Rijksmuseum van Natuurlijke Historie), Leiden, The Netherlands; MSH = fieldseries M.S. Hoogmoed; TCAP = fieldseries T.C.S. de Avila- Pires.