I took the morning off and went to Rock Creek (DC) first, then did a number of spots in western Montgomery County, going briefly to Hughes Hollow, Sycamore Landing Rd and then River Rd out as far as White's Ferry.  
   
  I found 27 warbler species in total at various sites - the highlight being the MOURNING WARBLER at Rock Creek that Dave mentioned.  I first heard it sing, and then got on it a few minutes later -and had nice views as it fed on or near the ground. Actually Dave, I was pretty pleased to have come across this as I missed it last year, so I could've burst into song myself...
   
  Other good birds at Rock Creek included a very cooperative LINCOLN'S SPARROW that perched up and preened for several minutes.  The warblers today were a very different mix to just 2 days ago - for example there were no "winged" warblers today (the females from Weds probably being the last push of these birds).  
   
  In Montgomery County I came across FOY (for me) BLUE GROSBEAK - at the horse farms along Edwards Ferry Rd, and a KENTUCKY WARBLER (see below).  Also had my year's first Grasshopper Sparrow but could not turn up a Chat at their usual sites, perhaps they are not in yet.
   
  Swamp and White-throated Saprrows are still around in some places to add to the sparrow diversity.  In contrast to warblers I found flycatchers to be pretty thin on the ground, with a few Acadian at Hughes Hollow and elsewhere and no other empids, nor a peewee.
   
  My total warbler tally for the day was:
  (RC MY = Rock Creek Maintenance Yard)
   
  N Parula - several seen well at RCMY, several heard
  Nashville - at least 2 at RC MY, one singing
  Tennessee - 1 singing in woods at back of RCMY
  Yellow - singing male at RCMY, also female there; a couple heard along River Rd
  Chestnut-sided - singing male (RC MY)
  Magnolia - a couple heard on way down to Yard, one seen there briefly
  Black-throated Blue - saw and heard 1 at RC MY and also heard another along Edwards Ferry Rd
  Yellow-rumped - definitely fewer around than 2 days ago
  Black-throated Green - female showed well at RC MY - saw/heard 2 males
  Yellow-throated - heard along C&O
  Praire - about 5 heard at different places along River Rd
  Bay-breasted - pretty certain I heard one singing in the woods on the way back from RC MY
  Blackpoll - heard at various places around Rock Creek - maybe 4 in total
  Blackburnian - female showed itself well at RC MY; one male singing at Nature Center
  Cerulean - male showed well at traditional site along C&O Canal off of Sycamore Landing Rd
  Black-and-White - 2 males at RC MY, 1 more singing at Nature Center
  American Redstart - good numbers of these at various spots (finally)
  Prothonotary - 1 singing at Hughes Hollow
  Worm-eating Warbler - 1 heard singing at RC MY
  Ovenbird - several seen well in woods at Rock Creek, around 10 more heard at various pts in Montgomery County.
  Northern Waterthrush - 2 along Hunting Qtr Rd, 2 more along C&O Canal off of Sycamore Landing Rd
  Louisiana Waterthrush - 1 by stream in woods on way back from MY to Nature Center
  Kentucky - 1 singing in woods 200 yds N of junction of Edwards Ferry and River Rd - seen only briefly flying between song perches
  Mourning - male at RC Nature Center (see above)
  Common Yellowthroat - everywhere (again, finally)
  Hooded - 1 male singing just before La Waterthrush at RC
  Canada - 2 showed well at RC MY
   
  Good birding
   
  Clive Harris
  Cabin John, MD