Colias scudderii
Colias scudderii, the willow sulphur, is a butterfly in the family Pieridae. It is found from Alaska south through the Rocky Mountains to northern New Mexico. The habitat consists of mountain meadows and willow bogs.
The wingspan is. Adults are on wing from June to August. They feed on flower nectar.
The larvae feed on the leaves of Salix species. Second, third, and fourth instar larvae hibernate.
Subspecies
- Colias scudderii scudderii
- Colias scudderii ruckesi Klots, 1937