Whilst being a little provocative, I wasn't suggesting they'd not met other bees, but that they were perhaps physiologically unable to cross breed. Over the course of the years I've come across a good number of ferral colonies disturbed during tree felling. Very few of them looked like my mongrels. Maybe there actually is a sub-species out there that hasn't been properly observed before.
I'm slightly saddened by the disparaging tone in some of the comments on here. Discussion shouldn't be tinged with belittling. We all have different experiences, different depths of knowledge and in different areas and specialities. My mother's boyfriend (in his late 80's and keeping bees since he was 7) said that he saw something new pretty much every week - he had over 200 hives around the county. I'm amazed at the superior tones adopted by some on here. Putting people down doesn't encourage discussion or the sharing of experience.