Its not hard to be wrong with these little guys!
It is an obsession with me, and now part of my job so I gotta be able to ID them. A good field guide goes a long way, I am loving the ROM's "Butterflies of Ontario", it has the handy arrows to show what to look for (which can be the difference between utter confusion and an identification) but one for your region is maybe better? Kaufman is good.