Cloudless Sulphur

Cloudless Sulphur (Phoebis sennae) females are yellow or white and the outer edges of both wings have irregular black borders, the upper forewing has a dark spot in a cell. This is one case where the female is more colorful than the males which are lemon yellow with no markings..
This is the most common large sulphur and the males patrol with a rapid, powerful flight, searching for receptive females. Then the eggs are laid singly on young leaves or flower buds of partridge pea plants, a prairie wildflower and the host plant for the Cloudless Sulpher.
These rapid fliers are commonly found in open spaces, brushy areas, gardens, deserts, and along seashores. They can be seen throughout most of the United States and during the spring and autumn as far north as Maine, Montana, and northern California.