A female Harford's Sulphur at Grizzly Flat in the San Gabriel Mountains, August 6, 2011.

A male Colias harfordii on the same day as the one above.

A male Harford's Sulphur about to leave this flower - these never perch with wings open. They can be difficult to distinguish in the field from certain yellow forms of the Orange Sulphur with which they often fly. But Harford's is yellow without orange on the dorsal side, and the black edging on the wing is usually narrower than in Orange Sulphurs. Little Dalton Canyon, July 8, 2006.

Another Harford's Sulphur. May 14, 2006 at Cactus Springs Trail in Riverside Co.