Abstract
Recent discoveries of zygodactyl birds in the Eocene of Wyoming, along with reinterpretation of previously described taxa, show that these forms belong to an extinct family, affiliated with the Bucconidae, for which we here propose the name Primobucconidae. The genera <i>Primobucco</i>, <i>Neanis, Uintornis, Botauroides</i>, and a new genus, <i>Eobucco</i>, are assigned to this family, and three new species, <i>Primobucco olsoni, Uintornis marionae,</i> and <i>Eobucco brodkorbi</i> are described. Primobucconids appear to have been the dominant small perching birds of the Eocene of North America.
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