Mari (in Phoenix), it's an interesting question that continues to be debated as researchers
examine the DNA of the two subspecies, among other elements.
Currently, the defining organization for this question — the American Ornithologists' Union (AOU) — does not have a new proposal to entertain a split that would result in species status for Myrtle and Audubon's. In fact, in recent years, an AOU committee turned down a proposal to create species status for more than Myrtle and Audubon's, but also, perhaps, Black-fronted and Goldman's subspecies within the Yellow-rumped complex.
For more current information, the following link is worth reading:
https://www.allaboutbirds.org/goodbye-yellow-rump-will-we-see-a-return-to-myrtle-and-audubons-warblers/
I'll provide more updates on this question as I learn of new information.
Regards to all, Daniel
Birding Guide
warblerwatch.com
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