Tyrant-flycatchers (Tyrannidae)

Alder Flycatcher (Empidonax alnorum) - HBW 9, p. 360

French: Moucherolle des aulnes German: Erlenschnäppertyrann Spanish: Mosquero Alisero

Taxonomy: Empidonax traillii alnorum Brewster, 1895, Upton, Maine, USA.
Formerly considered conspecific with E. traillii. Birds in NW of range (Alaska, Yukon Territory and NW Mackenzie) may average larger, with paler head and slightly paler back; named as race alascensis, but further studies required. Monotypic.

Distribution: Breeds from W Alaska S to SC British Columbia and E to Canadian Maritime Provinces, and from Great Lakes E in USA to New England and S to N Indiana, Ohio and, in Appalachians, to North Carolina. Winters mainly W South America, from C Colombia and E Ecuador S to E Peru and N & E Bolivia; probably also in E Panama and N Argentina.