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6 (5 pages Ms.) 35 species mentioned, and young of [[underlined]] Troglodytes hiemalis pacificus [[/underlined]] for the first time described (2) Diagnosis of some New Forms of the Genus [[underlined]] Formicarius [[/underlined]] Bodd. (3 pages, Ms.) New species described: (1) [[underlined]] Formicarius nigricapillus [[/underlined]] Cherr, Ms. (Costa Rica), (2) [[underlined]] Formicarius umbrosus [[/underlined]] (Eastern Costa Rica and Nicaragua), (3) [[underlined]] Formicarius saturatus [[/underlined]] (Venezuela, Trinidad and Columbia) (3) A Revision of the genus [[underlined]] Formicarius [[/underlined]] Boddaert. (80 pages, Ms.) Including full descriptions of all the known forms, and other important critical details.