Hecla Sulphur (Colias hecla Lefebvre)
Wing span: 1 3/8 - 1 3/4 inches (3.6 - 4.3 cm).
Identification: Wing fringes pink. Upperside deep orange. Underside of hindwing dusky green, usually with an elongate pink discal spot.
Life history: Caterpiller green with tiny black spots and a light lateral line along each side.
Flight: One flight from late June to mid August.
Caterpillar hosts: Alpine milk vetch.
Adult food: Flower nectar.
Habitat: Arctic tundra.
Range: Holoarctic. Greenland coast, northern Canada, northern and eastern Alaska, Yukon, and British Columbia.
