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) 



