Well I don't doubt that speciation occurs. Creationists since the time of Karl von Linne knew that the Created Kind was at least at the Genus level (Linne being a Creationist). However it could be that the definition of species is somewhat ambiguous... (OK, OK a new thread)
As far as the moths and NS I don't see where it wouldn't be an example of that. The environment changed and when it changed those organisms better suited to that new environment thrived (and became the majority) and those that thrived in the old environment were now the minority. Looks like I will have to go back and read that chapter in "Icons..." again to see what Wells really says. I'll be back...