NATURAL SCIENCES OP PHILADELPHIA. 81 



which it is associated, that nigriceps does to the continental form 

 lawrencii, which it replaces in Northern South America. 



Of the live following birds, referred by their respective authors 

 and others to the genus Myiarchus, I have no information : 



1. Myiarchus fasciatus, Landb., Leybold, J. f. O. 1865, 402. Mendoza. 

 S. Myiarchus cantans, Pelz., op. cit. 182. Brazil. Probably=^ra?i- 

 nulus. 



3. Myiarchus tricolor, Natt., Pelz. Orn. Bras. ii. 182. Brazil. Pro- 



baMy=nigriceps. 



4. Myiarchus gracilirostris, Pelz., op. cit. 183. Brazil. Probably= 



nigriceps. 



5. Tyrannus tuberculifer, D'Orb. and Lafr., Syn. No. G. D'Orb., Voy. 



Ois. p. 307, pi. 32, f. 1, 2. Bolivia. MyioMus tuberculifer, Gray. 

 Myiarchus tuberculifer, Cab. Tyrannula tuberculifer, Bp. Pyro. 

 cephalus {Onychopterus) tuberculifer, Gray, H.-L. No. 5523. An 

 Myiarchinus verusf Tbe description indicates a bird of the 

 Myiarchus pattern of coloration, and D'Orbigny says that it is 

 allied to M. ferox. 



1872.] 



