ORDER PASSERES. 215 



Dakota, northern Minnesota, northern Michigan, northern New York, 

 Pennsylvania (mountains), and New Hampshire; west in migration to 

 the eastern border of the Plains, eastern Texas, and eastern Mexico; 

 winters from southern Mexico and Guatemala to Panama; occa- 

 sional in migration in western Florida; accidental in Greenland. 



Empidonax difficilis BAIRD. 



RANGE. Western North America south to southern Mexico. 



a. Empidonax difficilis difficilis BAIRD. Western Flycatcher. [464.] 



Empidonax difficilis BAIRD, Rep. Expl. & Surv. R. R. Pac., IX, 1858, 

 198. (Fort Tejon, California.) 



RANGE. Western North America. Breeds from Glacier Bay, Alaska, 

 southeastern British Columbia, Montana, and southwestern South Dakota to 

 southern California and western Texas; winters in Mexico south to Cape San 

 Lucas, Tres Marias Islands, and Oaxaca. 



6. Empidonax difficilis cineritius BREWSTER. San Lucas Flycatcher. [464o.] 



Empidonax cineritius BREWSTER, Auk, V, Jan., 1888, 90. (La Laguna 

 [Sierra de la Laguna], Lower California.) 



RANGE. Breeds from San Diego County, California, and Hansen Laguna 

 to Cape region of Lower California. 



Empidonax virescens (VIEILLOT). Acadian Flycatcher. [465.] 



Platyrhynchos virescens VIEILLOT, Nouv. Diet. d'Hist. Nat., XXVII, 1818, 

 22. (Near Philadelphia, Pennsylvania.) 



RANGE. Eastern North America and northern South America. 

 Breeds from upper limit of Carolinian Zone in northeastern Nebraska, 

 central Iowa, Michigan, southern Ontario, New York, Connecticut 

 (casually), and Massachusetts (one instance) south to southern Texas, 

 the Gulf States, and northern Florida ; migrates through Yucatan and 

 Central America and winters in Colombia and Ecuador; casual in 

 Massachusetts; accidental in the Bahamas and Cuba in migration. 



Empidonax trailli (AUDUBON). 



RANGE. North America; in .winter south to Central America and 

 northern South America. 



