Thanks to Larry for posting the Yellow-rumped Warbler impending split  
information.  I knew of the rumblings of a split, but wasn't familiar  
with two of the proposed four species.

In the article referred to in Larry's post, these two are discussed  
briefly and it is noted that they are allopatric.  That means they  
are isolated, separate populations.  I followed up on this to learn  
where they occur.  I found:

"blackfronted warbler"). D. c. nigrifrons - breeds Chihuahua and  
Durango mountains in western Mexico. ...

Goldman's Warbler, of Guatemala, resembles Audubon's but has a white  
lower border to the yellow throat and otherwise darker plumage;

Thus, these two species (assuming the split becomes "official") will  
not be additions to the ABA list--unless Blackfronted strays up into  
the US Southwest--, but will be added to the North America list.   
(Alas, not my personal list...yet.)

Edge Wade
Columbia, MO
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