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A monograph of the Capitonid or scansorial barbets . TRACHYPHONUS SQUARICEPS Pl LVIII Illustration biodiversitylibrary org title Keulemans John Gerard Marshall Charles Henry Tilson Marshall NameFound Trachyphonus NameConfirmed Trachyphonus EOLID NameBankID Biodiversity Heritage Library monograph of the Capitonid or scansorial