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Medium-sized yellow butterfly, as pictured, with two distinctive spots on the underwing, as shown in the first photo above. I originally thought this butterfly to be a Southern Dogface (Colias cesonia)...but on further research I determined this to be an Orange Sulfur...markings are in line with the 2nd forewing photo above.
These butterflies are very common in southern Nevada metro areas, and in the surrounding Mojave Desert. They adapt well to areas with gardens and lawns…and are just as at home in the desert.
Orange Sulfurs reach their peak numbers in July and August, when their favorite nectar sources are available. They favor prairie clover, and many flowering plants such as that pictured.