ORDER PASSERIFORMES. 265 



Range. — Breeds in the Lower and Upper Austral zones from eastern Ne- 

 braska, Iowa, and southern parts of Wisconsin, Michigan, Ontario, southwest- 

 ern Pennsylvania, Maryland, and southern New Jersey south to southern 

 Texas, the Gulf coast, and central Florida. Winters from southern Texas, 

 southern Mississippi, and the coast of South Carolina (rarely Virginia) to the 

 Bahamas and Cuba, and through eastern Mexico to Yucatan and Guatemala. 

 Casual northward to southeastern Minnesota, New England, and New York. 



Polioptila caerulea amoenissima Grinnell. Western Gnatcatcher. [7516.] 



Polioptila caerulea amoenissima Grinnell, Proc. Calif. Acad. Sci., ser. 4, 

 XV, No. 16, Sept. 15, 1926, 494. (Pleasant Valley, Mariposa County, 

 California, 600 feet.) 



Range. — Breeds from northern interior California (Shasta County), 

 southern Nevada, southern Utah, and Colorado (El Paso County) south to 

 northern Lower California, Chihuahua, Sonora, Sinaloa, and Colima. Winters 

 from southern California southward. 



Polioptila caerulea obscura Ridgway. San Lucas Gnatcatcher. [751a.] 



Polioptila caerulea obscura Ridgway, Proc. U. S. Nat. Mus., V, 1882, 535 

 (note), March 21, 1883 [April 3]. (San Jose del Cabo, Lower California.) 



Range. — Austral zones of southern Lower California, north to about 

 lat. 28°. 



[Additional races of P. caerulea occur in Mexico and the Bahamas.] 



Polioptila melanura melanura Lawrence. Plumbeous Gnatcatcher. [752.] 



Polioptila melanura Lawrence, Ann. Lye. Nat. Hist. N. Y., VI, 1857, 

 168. (Texas = Rio Grande Valley.) 



Range. — Lower Austral Zone from southeastern California, southern 

 Nevada, central Arizona, west-central New Mexico, and the Rio Grande 

 Valley south to Tamaulipas, Sonora, Nuevo Leon, and San Felipe Bay, 

 Lower California. 



Polioptila melanura margaritae Ridgway. Margarita Gnatcatcher. [7526.] 



Polioptila margaritx Ridgway, BuU. U. S. Nat. Mus., No. 50, Pt. iii, 1904, 

 733. [Santa] Margarita Island [Lower California]. 



Range. — Lower California from about lat. 29° to lat. 24° 30'. 



Polioptila melanura abbreviata Grinnell. Xantus's Gnatcatcher. [752a.] 



Polioptila melanura abbreviata Grinnell, Proc. Calif. Acad. Sci., ser. 4, 

 XV, No. 16, Sept. 15, 1926, 497. (Cape San Lucas, Lower California.) 



Range. — Cape district of Lower California (Arid Tropical and Lower 

 Austral zones), north to La Paz. 



