Colias behrii

Colias behrii, the Behr's sulphur or Sierra green sulfur, is a butterfly in the family Pieridae. It is endemic to California's Sierra Nevada from Tuolumne County south to Tulare County.

The wingspan is 35 - 42 mm. Adults are on wing from July to August. They feed on flower nectar.

The larvae feed on Vaccinium species and Gentiana newberryi.