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.^[2]

Willow sulphur
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Lepidoptera
Family:	Pieridae
Genus:	Colias
Species:	C. scudderii
Binomial name
Colias scudderii Reakirt, 1865[1]
Synonyms
Colias scudderi Eurymus scudderi Colias flavotincta Cockerell, 1901

The wingspan is 38–51 mm (1.5–2.0 in). Adults are on wing from June to August. They feed on flower nectar.^[2]

The larvae feed on the leaves of Salix species (including Salix reticulata, Salix lutea and Salix planifolia). Second, third, and fourth instar larvae hibernate.^[2]

Subspecies

• Colias scudderii scudderii (Colorado, Utah, New Mexico, Wyoming)
• Colias scudderii ruckesi Klots, 1937 (New Mexico)