OF VIRGINIA 359 
HYPOTHETICAL. 
[761-B]. Planesticus migratorius achrusterus 
(Batchelder). Southern Robin. 
Raner.—Southeastern United States. Breeds in 
southern part of Carolinian zone from southern Illinois 
and Maryland to northern Mississippi, northern Georgia, 
and South Carolina. 
I have put this supposed subspecies in my Hypothetical 
List because I do not consider it as a breeding bird within 
our area. The 1910 A. O. U. check list has designated 
the birds breeding from the Eastern Shore of Maryland 
and Virginia southward along our coast region as 
“achrusterus,” a southern form. Personally, and I am 
joined in my views by some eminent ornithologists, I do 
not consider this a good subspecies, or recognize it as such, 
and my readers, other than specialists in speciation 
(apologies to Joseph Grinnell), need not worry about the 
slight differences in these supposed two forms. The data 
of the Robin (Planesticus migratorius migratorius) 
applies equally as well to this so-called southern form. 
GENUS SIALIA. 
[766]. Sialia sialis sialis (Linneus). Bluebird. 
Raner.—Eastern North America. Breeds from Lower 
Canadian to Lower Austral zone from southern Manitoba, 
northern Ontario, southern Quebec, and Newfoundland 
