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 Barrp. 
RaNGE.— Western North America south to southern Mexico. 
a. Empidonax difficilis difficilis Barrp. Western Flycatcher. ([464.] 
Empidonax difficilis Bairp, Rep. Expl. & Surv. R. R. Pac., IX, 1858, 
198. (Fort Tejon, California.) 
Rance.— 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. 
b. Empidonax difficilis cineritius Brewster. San Lucas Flycatcher. [464a.] 
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 viréscens (ViEILLOT). Acadian Flycatcher. [465.] 
Platyrhynchos virescens VimituoT, Nouv. Dict. d’ Hist. Nat., XX VII, 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). 
Rance.— North America; in winter south to Central America and 
northern South America. 
