The breeding-plumage Magnolia Warbler is quite distinctive with its bright yellow underparts with thick black streaks and black mask. Basic and immature plumaged birds are more difficult to identify. The yellow underparts with streaking confined to the flanks is also found in Prairie, Kirtland's, Black-throated Green, and Blackburnian Warblers. All these species lack a gray breast band and white tail band. Blackburnian has a bold yellow supercilium. Black-throated Green has a yellow face. Prairie wags its tail and has a different face pattern. Kirtland's Warbler has darker gray upperparts.
Length and wingspan from: Robbins, C.S., Bruun, B., Zim, H.S., (1966). Birds of North America. New York: Western Publishing Company, Inc.