The Dainty Sulphur butterfly is the smallest of the Pieridae family in North America. They are found in open spaces such as coastal flats, deserts, fields, and roadsides. The underwing is yellow and the tip of forewing is black, the upper forewing has black bars are the edge. The males have oval scent patch in hindwing bar. The colors vary from summer to winter. They fly low to the ground. The caterpillar is green and found on various host plants. They nectar on asters, marigolds, rabbitbrush, and others. Here is one in northern Arizona during the summer months.