inhabit the geugi'aphical aiva known as the I'hilijjpinc Lshuuls. as fixed 

 by the treaty of Paris and the supplementary purchase of islands by the 

 United States Government. The species of the Palawan Islands (Bala- 

 bac, Palawan, Calamianes. and Cuyos groups) have accordingly been 

 included. 



The Distribution Ijist of Pliilip])ine Birds prepared Ijy Dr. Frank S. 

 J>()urns and myself ( Proceedings of the Ignited States National Museum. 

 \'ol. XX. pp. r)4!>-.")(;(;, iSilS) enumerated 24'^ genera and 596 species 

 for this same area. The work of Mr. John Whitehead. Dr. Ivlgar A. 

 Mearns, Mr. Walter Goodfellow, Mr. John Waterstradt, and of Mr. .Mc- 

 Gregor and his Filipino assistants, together with such fragmentary work 

 as I myself have been able to carry on in connection with official trips 

 through the Islands, has raised this total to 284 genera, 091 identified 

 species, and two species (Oceanodroma sp. and loricuhis s]3. ) not identi- 

 fied. Some knowledge has been gained of the avifaunse of the Islands of 

 Ticao, Lubang, Cagayancillo, Agiitaya, Calayan, Cresta de Gallo, ISIaestro 

 de Campo, Semirara, East Balud, West Balud. and Sibay, the birds of 

 which were heretofore entirely unknown. 



The highlands of Mindanao have yielded a number of most interesting 

 new genera and species, and additional knowledge has been gained relative 

 to the bii'ds of Luzon, Mindoro, Masbate, Xegros, Samar, (*uyo, Culion, 

 Cagayan-Sulu, Fuga, Eomblon, and Sibuyan. 



From the information now available we may deduce the following con- 

 clusions relative to the zoological relationships of these several islands: 



Ticao belongs with the central group (Panay. Guimaras, Xegros, and 

 Masbate) rather than with Luzon. 



Lubang must be considered a detached fragment of lAizon. as it has 

 a number of characteristic I.iUzon species and entirely lacks those which 

 are especially characteristic of ^lindoro. One species (Aethopi/ga rubri- 

 nota McGregor) is, so far as we at present know, confined to this island. 



On Cagayancillo is found Cinnyris aurora, but no other of the charac- 

 teristic Palawan forms are known to exist there, while the occurrence of 

 such species as Centropus viridis, Hi/potaenidia iorijuaia, h'dl/iiia ciiri/- 

 zonoides, Lininoheanus fvscus, and Hicrococcyx fuya.v. and the con- 

 spicuous absence of many of the species which are most common on the 

 neighboring islands, lead to the conclusion that Cagayancillo is an oceanic 

 island of recent formation and that its bird po])ulation is composed of 

 the descendants of stragglers, most of which have |)rol)ably come in from 

 Negros or Mindanao, although C. aurora is evidently a wanderer from 

 Cuyo or Palawan. 



Agutaya belongs to the Palawan grouj). 



Calayan has a strong Formosan element. I'robably it will ultimately 

 prove that the Batanes and Babuyanes Islands form a group by them- 

 selves. 



Semirara belongs with Mindoro. 



