ANALYSIS OF THE TWO EDITIONS. 



The original edition of the "Check List" ostensibl}^ enumerates onl}^ 635 species 

 of North American Birds. This is owing to the fact that only full species are num- 

 bered, the many subspecies being given as a, b, &c., and some names being inter- 

 polated without corresponding numbers, both in the body of the list and in the 

 Appendix. By actual count there are found to be, in the body of the list, 750 ; to- 

 which 28 are added in the Appendix : 750 + 28 = 778. 



First, with regard to subtractions. It is in gratifying evidence of the general 

 accuracy of the original list, that it is found necessary to remove only ten (10) 

 names. Four of these are extra-limital ; six are mere sj-nonyms. The following 

 is the — 



LIST OF SUBTRAHEND NAMES. 



1. ^giothus fuscescens. Summer plumage of -(^. Z/nana. 



2. Centronyx ochrocephalus. Fall plumage of Passercvlus bairdi. 



3. Sphyropicus williamsoni. Male of S. thyroides. 



4. Lampornis mango. Extra-limital. 



5. Agyrtria linnaei. Extra-limital. 



6. Momotus cceruleiceps. Extra-limital. 



7. Ibis thalassina. Young of Pler/adis tjnarauna. 



8. Ardea wuerdemanni. Dichromatism of A. occidentalis. 



9. Sterna " longipennis." Meaning S. pikii Lawr. Young of S. macrura. 

 1 0. Podiceps cristatus. Extra-limital, as far as known. 



On the other hand, the numerous accessions to the list are in no less gratifying^ 

 evidence of the progress of our knowledge. There are no fewer than one hundred and' 

 twent}' additions to be made. The large majorit}' of these are bona fide species, and' 

 actual acquisitions to the North American list, being birds discovered since 1873 iu' 

 Texas, Arizona, and Alaska, together with several long known to inhabit Green- 

 land. It may be here remarked that although the Greenland Fauna has long been 

 usually claimed and conceded to be North American, yet the full list of Greenland 



