According to:
http://eclipse.dtl.pcs.k12.va.us/vtrail/Blue-skink.htm

the blue-tailed skink is actually the immature five-lined skink.

And then, of course, there's the Blue-Tailed Mole Skink found only in
Florida -- not to be confused with the blue-haired little old ladies
in other parts of Florida

Anne Lurie
NE Raleigh