HI:
The latest AOU Checklist supplement is available on-line at:

http://www.aou.org/checklist/Suppl46.pdf

The Black-backed Wagtail is RE-lumped with the White Wagtail.

--
Ian Paulsen
Bainbridge Island, WA, USA
A.K.A.: "Birdbooker"
"Rallidae all the way!"