ANDKKSON — THE BIRDS OF IOWA. I 27 



In presenting this work the writer desires to express his great 

 obligation and gratitude to Professor C. C. Nutting for continued 

 encouragement and assistance, as well as the liberal extension of 

 facilities, including free access to material and specimens neces- 

 sary to carry on the work; and to Professor H. F. Wickham for 

 valuable literature and notes furnished, and for helpful sugges- 

 tions and criticism. Mr. Robert Ridgway, curator of birds. 

 United States National Museum, very kindly identified some 

 sixty-seven specimens which were submitted to him for examin- 

 ation, while Dr. B. H. Bailey, professor of zoology at Coe Col- 

 lege, very kind ly permitted me to make extended examinations 

 of the collections in that institution. 



In the main, the nomenclature adopted in the following list is 

 that of the American Ornithological Union Check List, Second 

 Edition, and Supplements succeeding. In a few^ ca.ses I have been 

 impelled to follow the nomenclature of Robert Ridgway 's "Birds 

 of Middle and North America," Vols. I-III. 



