Vol. 35, pp. 17-38 March 20, 1922 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON STUDIES IN THE TYRANNIDiE. 11. The Restricted Genus Myiobius. BY W. E. CLYDE TODD. It is over nine years ago since the writer first had occasion to critically examine the status of the various members of this group, in connection with the description of a new species belonging thereto. This preliminary study sufficed to convince him that the group in question was in serious need of revision, certain of its components being but little known, and the inter-relationships of all the forms very imperfectly understood. With so much fresh material now available in the collections of the Carnegie Museum, and of the several institutions listed in Part I of the present series of papers, the time has seemed ripe for carrying out a long-cherished plan involving a fuller study of this genus. Three hundred and ninety-nine specimens in all, including types or topotypes of most of the described forms, have been examined in preparing the present paper, which follows the same general plan as the writer's recent revision of the genus Pipromorpha. Acknowledgments are due to the same parties as are named in that paper for the loan of material. Genus Myiobius Darwin. Platyrhynchus, part (not Platyrinchus Desmarest, 1805) Spix, Avium Species Novae Bras., II, 1825, 9 (no type specified). Tyrannula (not Tyrannulus Vieillot, 1816) Swainson, Zool. Journ., Ill, 1827, 358 (orig. diag.; type, Muscipeta barbata = M uscicapa barbata Gmelin). Myiobius Darwin, Zool. Voy. Beagle, III, Birds, 1839, 46 (ex Gray, MS.; vice Tyrannula Swainson; type, Mitscicapa barbata Gmelin). — Gray, List Gen. Birds, 1840, 30 (syn.); ed. 2, 1841, 41 (syn.).— Gray, Gen. Birds, I, 1845, 248, part (list of species). — Gray, Cat. Gen. and Subgen. Birds, 1855, 49 (syn.). — Cabanls and Heine, Museum Heineanum, 6— Proc. Biol. Soc. Wash., Vol. 35, 1922. (17)
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