Vireos (Vireonidae)

Bell's Vireo (Vireo bellii) - HBW 15, p. 422

French: Viréo de Bell German: Braunaugenvireo Spanish: Vireo de Bell
Other common names: Least Bell's Vireo (pusillus)

Taxonomy: Vireo bellii Audubon, 1844, "short distance below Black Snake Hills" = near St Joseph, Missouri, USA.
Possibly most closely related to V. atricapilla, but may be closest to V. griseus. Four subspecies recognized.

Subspecies and Distribution:

bellii Audubon, 1844 - breeds C & S USA (from North Dakota E to Indiana, S to C Texas); migrates to Mexico, Guatemala, El Salvador, Honduras and (rarely) extreme NW Nicaragua.
pusillus Coues, 1866 - breeds S California S to extreme NW Mexico (NW Baja California); migrates to S Baja California.
arizonae Ridgway, 1903 - breeds SW USA (S Nevada, SW Utah, NW Arizona and SW New Mexico) S to NW Mexico (NE Baja California and Sonora); migrates to W Mexico (C & S Sonora S to Jalisco, rarely to C Michoachán).
medius Oberholser, 1903 - breeds SC USA (S New Mexico, SW Texas) S to NC Mexico (S to San Luis Potosí, probably SW Tamaulipas, possibly SW Durango); migrates to W Mexico.