In seasons with heavy monsoons, this butterfly is seen in massive migrations which are frequent in Texas but more rare in the southwest.

[3] Greener individuals have a whitish vein in the center of the hindwing and a bright yellow forewing basal patch.

Queen Alexandra's sulphur has more yellow on the underside of the forewing and has a whitish spot in the center of the hindwing.

[6] The statira sulphur has a more yellowish upper side and the underside of the wings is pale greenish to white with females having light pinkish markings.

[2] This butterfly is seen almost all year in southern Texas[2] and is seen from early July to mid-November in Arizona.