What a wonderful, prolonged fall migration. I have been enjoying two fox sparrows in my yard for the past week. I have also observed more than the usual number of ruby-crowned kinglets and sapsuckers in various places in the past few weeks. I have two questions about fall plummages which I haven't been able to resolve by looking in the field guides: A grey catbird seen well by several birders at Great Falls NP on Nov. 15th. had the right field marks, including the rusty undertail coverts, but lacked the black cap. Is this a stage of immature plummage, or merely an individual plummage variation? Kinglets I have seen in three different locations in the past two weeks, seemed to lack eye-rings and eye-lines. I finally identified one as a ruby- crowned at Riverbend when it raised its red crest while pursuing another. Two seen at Occuquan NWR by several observers on Nov 14 posed a similar problem--no noticeable eye-rings and no eye-stripes. Are these field marks sometimes absent in immature or fall plummages in either or both kinglet species? Thanks, Ralph Wall Great Falls, Va.