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Google lens says Mexican yellow. They were so flighty I was lucky to get this shot; I took several. After further Rx I found this: Cloudless Sulphur http://www.arizonensis.org/sonoran/fiel ... ennae.html
After good summer rains they may disperse into the Sonoran Desert, occasionally in astounding numbers. Look for them August to October. The caterpillars feed on various members of the Ceasalpinioidae, a subfamily of the legumes that includes Desert Senna and Palo Verde. The males are solid yellow (sometimes with a greenish cast), but females have a narrow black border and additional small black markings.
The Mexican Yellow (Eurema mexicana, sometimes called the Wolf-Face Sulphur) is a North and South American butterfly in the family Pieridae. It occurs mainly in Mexico but occasionally is found in central and southwestern USA and rarely in Canada.
After good summer rains they may disperse into the Sonoran Desert, occasionally in astounding numbers. Look for them August to October. The caterpillars feed on various members of the Ceasalpinioidae, a subfamily of the legumes that includes Desert Senna and Palo Verde. The males are solid yellow (sometimes with a greenish cast), but females have a narrow black border and additional small black markings.
The Mexican Yellow (Eurema mexicana, sometimes called the Wolf-Face Sulphur) is a North and South American butterfly in the family Pieridae. It occurs mainly in Mexico but occasionally is found in central and southwestern USA and rarely in Canada.