Clouded Sulphur Butterfly

The markings of the Clouded Sulphur are quite similar to those of an Orange Sulphur, however, there is no orange on this butterfly and its yellow colouring is very light and almost faded looking. As well, the post median markings on the hind wing do not seem as prominent as those of a Orange Sulphur. At first I thought perhaps this might be a Pink-edged Sulphur as the pink edging and head on this butterfly is very strong but the central spot on the hind wing is double whereas the spot on the hind wing of the Pink-edged is a single one. Also the Pink-edged sulphur has no hind wing post median spots.