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Phoebis philea philea
Yellow Sulfur butterfly with pink blotches. "The wingspan is 68 to 80 mm" - Wikipedia
San Diego Zoo Safari Park's butterfly exhibit. This butterfly is "found in the Americas including the Caribbean. The species habitat is in tropical scrub, gardens, fields, and forest edges." - Wikipedia
The color is exactly the key issue for ID. Quite a tricky one, since as you stated before all these sulphurs looks very similar and have a great variability within the species. The quite bright orange color and the stained apical edges let me suggest Philea and not Sennae or Agarithe.
I just had to take a pic of this one with the colors! Thanks Nopayahnah.
Liam, it does look similar! These Sulphur butterflies are all so similar.
Looks like the Cloudless Sulphur we get here in Georgia.
http://en.wikipedia.org/wiki/Cloudless_S...