@Spaman addressed that at the top of the page:
Although I do wonder if that quest could be change from a killing quest to a 'detect X Wither Skulls', perhaps?
Yes I'm afraid when I did that quest and tested it I managed to find wither skeletons and never actually came across the regular black skeletons so was unaware of their existence. I've since discovered like you that mine was an anomaly and the regular black skele's abound and the wither skele's don't. Although I can't do anything about the 1.4.3 version as its already released, wither skeletons have been taken off the kill requirement in the 1.5.0 version and replaced with something more suitable. I mean Blizz's do live in the Nether don't they? lol.
EDIT: Its getting bad when I don't remember how I'd already made a workaround for the wither skeleton challenge isn't it? But I had and it still involves killing a solitary wither skeleton but I have made an allowance for those that just can't find one. You'll have to play the game to find out what it is though..........
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