POSTSCRIPT 



The present volume, covering the birds of the Princeton Patagonian 

 Expeditions, has been subject to long but unavoidable delays. 



The original authors died about the time of the appearance of Part II, 

 and arrangements were made with the present writer to continue the work. 

 Part III, the manuscript of which had been completed, was published just 

 as it was left by the authors, while Part IV was based largely upon their 

 notes. 



The World War then caused a long delay in continuing the work, and 

 it has only now been possible to bring out the concluding part. While a 

 few notes and extracts from published works left by the authors have been 

 incorporated, where possible, the entire manuscript of Part V has been 

 written by the undersigned, and he desires here to express his obliga- 

 tion to Dr. Alexander Wetmore, Assistant Secretary of the Smithsonian 

 Institution for invaluable assistance in working out the ranges of the 

 Argentine and Patagonian species and deciding which should be in- 

 cluded in the present work. He is further indebted to Mr. James Lee 

 Peters, from whose Report on "Some Summer Birds of Northern Pata- 

 gonia" many quotations have been taken. To the Academy of Natural 

 Sciences of Philadelphia, the U. S. National Museum, and the Museum of 

 Comparative Zoology, he is indebted for the loan of specimens of species 

 not contained in the Princeton collection, from which original descriptions 

 have been drawn up for this report. 



All of the colored plates, prepared under the direction of the late Mr. 

 Scott, pertain to birds treated in the last part of the work. Unfortunately 

 there is no record of what specimens were used in making these plates. 

 Some of the names engraved upon them do not, apparently, apply to the 

 species figured, while some of the species are obviously extralimital so far 

 as Patagonia is concerned. All of these plates have been included, how- 

 ever, and the names corrected or brought up to date in the explanations. 



In view of the many recent publications relating to the birds of Pata- 

 gonia and their distribution, it seems hardly advisable to discuss this sub- 

 ject here, but simply to refer the reader to the leading works in which the 

 information may be obtained. 



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