Bob,
   Have you looked at the graph of Blackpoll Warbler in the Yellow Book? It frequently is heard into early June and sometimes later as in this year when the migration was running later than usual.
--
Bob Ringler
Eldersburg MD

 
---- Bob Hartman <> wrote: 
> When I arrived at LB at about 7:15 this AM, a bird was singing what sounded 
> to me just like a Blackpoll Warbler song.  It was near the top of the big 
> tree at the parking lot entrance, and persisted for about 5 minutes.  I 
> never got a good look at it, but when it flew up the hill it seemed warbler 
> sized, and black/white.  All my Maryland Blackpoll sightings have been 
> between May 7 and May 16, so a sighting now must be unlikely.  If not a 
> Blackpoll, what else could it be?  What I heard was 10-12 high-pitched 
> chirps, at a rate of about 4 per second (faster than a Black-and-White 
> Warbler or a Bay-breasted, and not as squeaky as a Cape May), then repeating 
> after a pause of about 10 seconds.  The recordings sound exactly like that 
> to me.
> 
> Other than that, the only unusual bird I encountered was a heard-only 
> Kentucky, up the hill (north) from the "dip" in the trail.  The L. 
> Waterthrushes seem to have stopped singing, and the few C. Yellowthroats I 
> heard were singing a very elaborate song, certainly not "witchety".
> 
>     Bob Hartman
>     Colesville, MD