Taken in my back yard last Spring through Summer. Marana, Az with a canon powershot sx10is
During the Summer monsoons and occasional springs, large numbers of this mostly Mexican Species migrate northward into the Southwest. This influx may be so strong that several can pass over a given location every minute, pausing only at a damp spots and nectar before moving northward again.
They establish temporary colonies where larvae food plants are available, only to be wiped out by freezing temperatures in winter.
Though not true southwestern residents, cloudless sulphers in their seasonal abundance are hard to miss. males are immaculate, bright lemon-yellow; Females are pale orange to greenish-white. If disturbed while copulating, they may take flight without disengaging, the male flying with the female hanging underneath.