Coliadinae

Coliadinae, the sulfurs, sulphurs, or yellows, are a subfamily of butterflies with about 300 described species.

There are 36 species in North America, where they range from Mexico to northern Canada. Males of most species are different from females, including, (for example, in the genera Colias and Gonepteryx) brilliant UV reflections which the females lack.

https://en.wikipedia.org/wiki/Coliadinae