Harford's Sulphur - Colias harfordii
A male Colias harfordii at Grizzly Flat in the San Gabriel Mountains, August 6, 2011. This one was roosting in the shade in the morning.
Harford's Sulphur - Colias harfordii
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.
Harford's Sulphur - Colias harfordii
Another Harford's Sulphur. May 14, 2006 at Cactus Springs Trail in Riverside Co.
egg of a Harford's sulphur - Colias harfordii
I found a female ovipositing on tiny clover plants in a lawn in Palm Desert and helped myself to a couple of eggs to raise. I will probably have to switch them to a different plant such as deerweed. These eggs were smaller than those of Zerene eurydice that I collected the day before at Cactus Spring Trail, but otherwise they were pretty much indistinguishable to me. July 27, 2020.

©Dennis Walker