White Lies are those harmless little exaggerations of the truth that everyone pulls out of their pockets on special occasions when they don't want to be caught having done something they shouldn't have done in the first place.
1. "Honey, why does the car have a ding on the front right bumper?". Reply, "Really? I hadn't noticed that."
2. "Honey, where did all the beer you bought yesterday go?" Reply, "I don't know. Did you drink it?"
3. "Honey, why does my favorite shirt have a brown scorched mark on the collar". Reply, "How should I know?"
Now, black flies are entirely different in nature. These flies are those pesky insects that bite you repeatedly. They are not harmless! Their bites are very annoying. And, where there's one, you will find more. Entirely different than white lies.
I hope this post has cleared up any confusion you may have had. If you would like to add a few more examples of white lies vs. black flies for added clarity, please do so. I believe, at least, TL and Alantru should be able to shed more light on this topic.
When nature calls
10 hours ago