Large Orange Sulphur Butterfly

I suspect that this is a Large Orange Sulphur Butterfly, Phoebis agarithe. They were flitting around in profusion on the wet side of Oahu but almost never landed anywhere where I could get a good snapshot of them. I finally found one that was willing to stay still long enough to get a photo outside the Honolulu Zoo, half an island away. As opposed to their name, these butterflies are a wonderful lemon yellow. Of course, I might have misidentified them as well.