I'll add to the mix...

I just read this last night in Nick Lyon's 'A Flyfisher's World' - in the story Fly fishing For Anything, Any Way:

"The British generally call all flies that don't imitate an actual insect - even when they're nifty fish catchers - "lures."

I suppose I fling lures sometimes, but I don't like it. I even resort to bait (wooly bugger, clouser, etc) occasionally and i cast them with a fly rod... but I guess I'm finally becoming a fly fisherman in the above sense. I almost hate having to resort to something that can't be mistaken for something real in a fishes life. This is not to say that I do not imitate non-insect life at the end of my tippet, but I don't prefer it....