x PREFACE 



comradeship of friends well schooled in the 

 field of ornithology, who have been wit- 

 nesses with me of some rarer migrant war- 

 bler or sparrow. All of this companionship 

 has been a pleasant aid and is gratefully 

 recalled. 



Those who have assisted me while I have 

 been preparing the manuscript of this vol- 

 ume must have my gratitude expressed to 

 them by name. To Messrs. Francis H. 

 Allen and William Brewster and Dr. 

 Charles W. Townsend I am indebted for 

 valuable suggestions. Mr. Glover M. Allen, 

 secretary of the Boston Society of Natural 

 History, has guided me through certain dif- 

 ficulties of nomenclature and performed for 

 me the further service of examining the 

 chronicled records of other observers. Mr. 

 F. H. Allen, Mr. Eugene E. Caduc, Miss Is- 

 abel P. George, Mr. John H. Hardy, Jr., Dr. 

 Manning K. Rand, Mr. Bradford Torrey, 

 and Dr. C. W. Townsend have contributed 

 names of species to the list, which otherwise 

 it would have lacked, nine names in all. 

 These fellow observers, and Messrs. G. M. 



