252 MESSRS. SCLATER AND SALVIN ON [Mar. 4, 



When we consider how little is known of even the higher mammals, 

 and how limited at present is the range of geological inquiry, we 

 must acknowledge that, for some time to come, all generalizations 

 bearing on the question of our origin are premature ; for a vast 

 field for observation still widens out before us, within the boundaries 

 of which we have but lately entered. 



6. On the Birds of Eastern Peru. By P. L. Sclater, M.A., 

 Ph.D., F.R.S., Secretary to the Society, and Osbert 

 Salvin, M.A., F.Z.S. With Notes on the Habits of the 

 Birds, by Edward Bartlett. 



[Keceived February 7, 1873.] 

 (Plates XXV. & XXVI.) 



In our first paper on the collections made by Mr. Edward Bartlett*, 

 we have given an account of the principal authorities on the orni- 

 thology of Eastern Peru. In that and subsequent communications 

 we have also given lists of the greater part of Mr. Bartlett' s col- 

 lections. 



Soon after his return home, Mr. Bartlett furnished us with a 

 complete list of the birds he had obtained, based upon our papers, 

 together with valuable notes on the habits of many of the species. 

 This list, however, on account of changes in nomenclature and 

 imperfect determinations, required thorough revision ; and it is only 

 lately that we have been able to devote the necessary time to that 

 purpose. 



In order to make it more complete we have included in the list, 

 besides some additional species brought home by Mr. Bartlett on his 

 return, the names of the species obtained by Mr. Bates from the Rio 

 Javari, and by Mr. Hauxwell at Pebas and on the Huallaga and 

 Ucayali. Thus the present paper contains a summary of nearly all 

 that is accurately known of the ornithology of the most eastern part 

 of the wood-region of Eastern Peru, from its extreme eastern boundary 

 (the Javari) to the district traversed by Mr. Bartlett on the western 

 bank of the Huallagaf. 



* Proc. Zool. Soc. 1866, p. 175. 



t The following is a complete list of the ornithological papers referring to 

 this district : — 



1. On a Collection of Birds transmitted by Mr. H. W. Bates from the Upper 



Amazon. By Philip Lutley Sclater. P. Z. S. 1857, p. 261. 



2. Description of eight new Species of Birds from South America. By John 



Gould. P. Z. S. 1855, p. 67. 



3. Catalogue of Birds collected by Mr. E. Bartlett on the river Ucayali, 



Eastern Peru, with Notes and Descriptions of New Species. By P. L. 

 Sclater and Osbert Salvin. P. Z. S. 1866, p. 175, 



4. On some additions to the Catalogue of Birds collected by Mr. E. Bartlett 



on the river Ucayali. By P. L. Sclater and Osbert Salvin. P. Z. S. 1866, 

 p. 566. 



