THE MIGRATIONS OF OTHER BIRDS 205 



The wood warblers are found only in the New 

 World, where they have their centre of abundance 

 in North America. A few are mainly sedentary, as 

 is the case with the form of orange-crowned warbler 

 {Vermivora celata sordida), found on the Santa 

 Barbara Islands in California, which remains in 

 winter on Santa Catalina, though migrants range 

 to the mainland opposite, even as far as Haywards 

 and Palo Alto. The yellow-throat of Florida 

 {Geothlypis trichas ignotd) so far as known is entirely 

 sedentary, as are the yellow-throats in the marshes 

 of the San Diegan district (G. /. scirpicola), and 

 those of the vicinity of San Francisco Bay (G. /. 

 sinuosa) in California. 



The pine warbler of the east withdraws from the 

 north to concentrate within the southern limits of 

 the breeding range, the only one of our species that 

 has this habit. It breeds north into southern Can- 

 ada, and in winter is found north to Virginia and 

 Illinois and, casually, farther. The few that cross 

 into Tamaulipas in northeastern Mexico are about 

 the only ones that pass beyond the southern limits 

 of the breeding range. 



The myrtle warbler is the only species that seems 

 to be unaffected particularly by cold, as, though in 

 winter it is found south to the Greater Antilles, 

 Mexico, and even to Panama, it remains common 

 in the southern United States, and winters regu- 



