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H. Knowlton in his Birds of the World 

 (New York, 1909). Sub-orders and 

 sub-families have been omitted except 

 where they seemed necessary for clear- 

 ness. Dr. Knowlton's work together 

 with that of Dr. F. M. Chapman 

 (Handbook of Birds of Eastern North 

 America, New York, 1912) have both 

 been largely used in preparing the 

 descriptions of orders and families. Dr. 

 C. W. Eichmond has also given us 

 many helpful suggestions as to the 

 systematic side of the notes. While 

 permission has been secured from these 

 authorities to make use of their works, 

 no quotation marks have been used, 

 and they are in no sense responsible 

 for the form in which the statements 

 appear. 



In the descriptions of individual 

 species we are very much indebted to 

 the very careful notes on Chinese birds 

 made by the late Dr. Paul D. Bergen, 

 the manuscript copy of which he very 

 kindly turned over to us when he had 

 to leave China on account of his health. 

 We have revised most of these and 

 have compared our final descriptions 

 with others or checked them over with 

 the skins where these were available. 



We have also had access to many 

 other standard works on birds of the 

 other parts of the world and have 

 tried to make the errors as few as 

 possible. If, however, any mistakes 

 occur which would mislead in the 

 identification of the birds listed we 

 will appreciate having them pointed 

 out to us. 



CLASSIFICATION. 

 ORDER.— C0LYM81F0RMES, Diving Birds. 

 Family. — Gavidae, Loons. 

 Family. — Podicipedidae, Grebes. 



