Black-throated Blue females ?

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I've noticed this year what I thought were female Black-throated Blue Warblers with a white edge along the lower front edge of the wing.  Birds that are brownish olive in color with a white primary patch.  This morning I saw 6 BTB females, and two of them had this white edge.  Since the adult male has this white edge, I'm wondering if the birds I'm seeing with this white edge on the wing are in fact the young males. I looked in "Warblers of the Americas" by Curson, Quinn and Beadle and their depiction of a first year male doesn't show it.

Does anyone know the answer to this ?

Thanks in advance.

Good Birding,

Darius Ecker (dariuse@abs.net)

Columbia, Maryland

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