ON NORTH AMERICAN ZOOLOGY. 



167 



the grallatores and natatores, two thirds of these orders being 

 common to the two, while in the aggregate of the other orders 

 only between one sixth and one seventh are common. As both the 

 waders and water-birds are very migratory, we might be induced 

 to infer that it is from this cause that so many of them are iden- 

 tical on both sides of the Atlantic, but on investigating the habits 

 of the species^ we find that several which do not migrate at all, 

 exist in every quarter of the globe, and some owls, which are the 

 most resident birds of prey, inhabit very many distant countries 

 witliout any appreciable change of form in the gpecies. 



Obs. — In the following lists species which are common to Exirope and America 

 are marked by an *. The range is denoted by degrees of latitude. The references 

 are to plates, and the followng abbreviations are used : — 



Col, Planches coloriees, Temminck, &c. — Enl., Planches enluminees, &c. — A., 

 American Ornithology, by Audubon, &c. — Vig., Ornithological Appendix to Capt. 

 Beechey's Voyac/e, by N. A. Vigors, Esq. — King., Birds of Patagonia, Zool. 

 Journ., by Capt. King, &c. — Sw., Swainson, Phil. Journ. — Licht., Deppe's Sale- 

 List of Birds, ^c, Berlin. — F.B.A., Fauna Bureali-Americana. — Cat., California. 

 — Me^., Mexico, &c. 



Mr. Swainson's five genera of faJconidce are falcn, accipiter, aquiUt, cymindis, and 

 bufeo, coiTcsponding to the groups denoted by brackets in the succeeding table ; and 

 of his five genera of sirigidte, the two first, strix and asio, are indicated by brackets ; 

 and the three abeiTant ones, ni/ctea, nyctipeles, and sumia, are each represented by 

 a single North American species. 



