Never had to eat one, but from what I have read, stay away from bugs that have very bright colors, obnoxious smells, or extremely bitter tastes.
Bright colors in nature usually serve as a warning to predators that the potential meal is toxicI definitly wouldn't think twice about eating an insect that had an obnoxious smell. What is it about the bright colored ones? Does it mean something specific? I guess you would also want to watch out for the ones with stingers!