MARYLAND YELLOW-THROAT. 115 



from New Mexico and Arizona to British Columbia, and occurs east 

 regularly to the foothills of the Rockies, and occasionally many miles 

 out on the plains. In the mountains it breeds to 9,000 feet. It 

 winters from Lower California to Colombia," South America, and is 

 most common along the main range of the mountains. 



Sjjrhig migration. — The earliest migrants of the Macgillivra}^ war- 

 bler seen in the Huachuca Mountains, Arizona, were recorded April 11, 

 1902. In southern California a few have been seen as earl}^ as the 

 last of March, but the general time of arrival in the southern part of 

 the State is the first ten days of April. Farther advance northward 

 is remarkably slow. The average date of arrival in northern Colo- 

 rado is May 13; at Cheyenne, Wyo., May 14, and at Great Falls, 

 Mont., May 28. Some records of the first noted are: Fort Klamath, 

 Oreg., May 11, 1887; Beaverton, Oreg., May 18, 1885; Columbia 

 Falls, Mont, May 19, 1885; Chelan, Wash., May 21, 1896; Burrard 

 Inlet, British Columbia, June 2,1885, and Chilliwack, British Colum- 

 bia, June 8, 1888. 



681. GeotMypis trichas (Linn. ). Maryland Yellow-throat. 



Breeding range.— T\\qyq are three forms of the Mar3dand yellow- 

 throat on the Atlantic coast, of which trichas is the intermediate, 

 breeding from Georgia to Maryland and less commonl}^ to Delaware, 

 southern Pennsylvania, and southern New Jersey. The range north- 

 ward is occupied by hrachidactyla^ and southward in Florida and along 

 the Gulf coast by ignota. In the southern part of its range trichas is 

 the form found on the higher lands to the base of the mountains, while 

 the coastal plain and the swamps are occupied by ignota. 



Winter range. — The typical form trichas passes in winter but little 

 south of its breeding range, occupying at this season the Carolinas, 

 Georgia, Florida, and the northern Bahamas. Occasionally one is seen 

 in winter much farther north along the coast. The migrations of this 

 form are so slight that it is not possible to separate the records of its 

 occurrence from those of Irachidactyla. 



681b. Geothlypis trichas ig-nota Chapm. Florida Yellow-throat. 



The Florida yellow-throat is an inhabitant of the Austroriparian life 

 zone. It breeds abundanth^ in Florida and southern Gebrgia, whence 

 it ranges in a narrow belt along the seaward edge of the coastal plain 

 north to the Dismal Swamp of Virginia, and west to Louisiana. It is 

 largely resident in the Gulf States, its migrations being principally 

 restricted to a slight southward retiring of the more northern birds of 

 the Atlantic coast, and the crossing of some of the Florida birds to 

 (Juba. In neither of these movements can the records be separated 

 from those of the more northern trichas. The subspecies breeds 



«Sliarpe, Cat. Birds Brit. Mus., X, p. 364, 1885. 



