Contents of Volume XXI. 



{Hylocichla guttata pallasti) in Eastern Massachusetts, 2S4 ; Two 

 Additions to the Bird Fauna of Kansas, 284; Mortality among 

 Young Birds, Due to Excessive Rains, 284 ; The Rapidity of 

 Wing-beats of Birds, 286 ; A Correction, 2S6 ; Audubon's Orni- 

 thological Biography, 286 ; Delaware Bird Notes, 286 ; Bird 

 Notes from Shelter Island, Long Island, N. Y., 287 ; Notes Con- 

 cerning Certain Birds of Long Island, N. Y., 287 ; British 

 Columbia Notes, 2S9 ; The Ipswich Sparrow, Kirtland's Warbler, 

 and Sprague's Pipit in Georgia, 291. 



RECENT LITERATURE. 



Coues's 'Key to North American Birds,' Fifth Edition, 292; Chap- 

 man's ' Color Key to North American Birds,' 296 ; Dawson's ' The 

 Birds of Ohio,' 297 ; Mrs. Bailey's ' Handbook of Birds of the 

 Western United States,' Second Edition, 299; Mrs. Wheelock's 

 'Birds of California,' 299; Torrey's 'The Clerk of the Woods,' 

 300 ; Mrs. Miller's ' With the Birds in Maine.' 301 ; Kumlien and 

 HoUister's ' The Birds of Wisconsin,' 301 ; Silloway's ' The Birds 

 of Fergus County, Montana,' 302 ; Oberholser's '"Review of the 

 Wrens of the Genus Troglodytes, 303 ; Oberholser on the Amer- 

 ican Great Horned Owls, 304; Snodgrass and Heller on the 

 'Birds of the Galapagos Archipelago,' 305; Shufeldt on the 

 Osteology of the Halcyones and Limicola;, 306 ; Evans's 'Turner 

 on Bird's,' 306; Recent Papers on Economic Ornithology, 307; 

 Audubon Societies in their Relation to the Farmer, 309 ; Sum- 

 mary of Game Laws tor 1903, 309. 



NOTES AND NEWS. 



Obituaries: Gurdon Trumbull, 310; Josiah Hooper, 311; Lyman 

 S. Foster, 312. Ornithological Works in Prospecl, 312. 



NUMBER III. 



The Biology of the Tyrannid.e with Respect to their 



Systematic Arrangement. By Dr. H. von Ihering. . . 313 



A Discussion of the Origin of Migration. By P. A.Taverner. 332 



Extracts from an Unpublished Journal of John James Audu- 

 bon. By RutJive7i Deatie. ....... 



The Effect of Altitude on Bird Migration. By Wells W. 

 Cook. •'.......... 



Spring Migrations of 1903. By Elon Harvard Eaton. 



Th^Ca?,^ 0¥ Megalestris vs. Catharacta. By J. A. Allen. . 



Additional Notes on the Birds of the Upper Pecos. By 



Florence Merriam Bailey. . -5^9 



The Origin and Distribution of the Chestnut-backed Chick- 

 adee. Josef h Grinnell 364 



334 



338 

 341 

 34.? 



