The Migration of North American Birds 91 



and east to the Sierra Nevada, to northwestern Nevada, central southern 

 Oregon, and the Cascade Mountains in western Oregon. 



Belding's Jay {Aphelocoma calif ornica obscura) occupies the coast region 

 of southwestern CaUfornia and northern Lower CaHfornia, north to the San 

 Gabriel and San Bernardino Mountains, California south to Santa Ana, Lower 

 California, at about 29° 20' north latitude, and east to the San Bernardino 

 Mountains, California. 



Xantus's Jay {Aphelocoma californica hypoleuca) is found in the southern 

 two-thirds of Lower California, ranging from Cape San Lucas north to Yubay 

 at about 29° 15' north latitude. 



The Texas Jay {Aphelocoma californica texana) ranges in central and cen- 

 tral western Texas east to Kerr County, north to Taylor County and the 

 Davis Mountains, west to the Davis Mountains and the Chinati Mountains, 

 and south to the Chisos Mountains. 



Woodhouse's Jay {Aphelocoma californica woodhouseii) ranges in the 

 western United States north to southern Wyoming, southern Idaho, and 

 southeastern Oregon, west to western Nevada and southeastern California, 

 south to southeastern Arizona, southern New Mexico, and the northern part of 

 central western Texas, and east to eastern New Mexico and eastern Colorado. 



SANTA CRUZ JAY 



The Santa Cruz Jay {Aphelocoma insular is) is resident and confined to Santa 

 Cruz Island in the Santa Barbara group, California. 



Notes on the Plumage of North American Birds 



FIFTY-SIXTH PAPER ,■.■-, 



By FRANK M. CHAPMAN 



(See Frontispiece) 



Arizona Jay {Aphelocoma sieherii arizonce) . — In juvenal ^nestling) plumage 

 the entire upperparts are uniform gray, the underparts much as in the adult. 

 At the postjuvenal molt these slight differences disappear and on its comple- 

 tion young and old are alike in color. There are no sexual or seasonal differences. 



Sieber's Jay ranges over the greater part of the Mexican tableland, some 

 six forms of it being recognized, of which two enter the United States, the 

 present, and Couch's Jay. 



Florida Jay (Aphelocoma cyanea). In juvenal (nestlingj plumage the crown, 

 nape, and breast-band are sooty instead of blue, the back somewhat darker, the 

 underparts whiter, and the throat unstreaked; but these differences disappear 

 with the postjuvenal molt, when all but the wings and tail-quills are shed; 

 and thereafter young and old are alike. 



The Florida Jay must not be confused with the Florida Blue Jay. The latter 



