Phoebis sennae, the
cloudless sulphur or
cloudless giant sulphur, is a mid-sized butterfly in the family Pieridae found in the New World. There are several similar species such as the yellow angled-sulphur (
Anteos maerula), which has angled wings, statira sulphur (
Aphrissa statira), and other sulphurs, which are much smaller.
(Wikipedia)