Wingspan 34–40 mm. Ground color of forewing upperside gray-brown, with strongly serrated wavy lines and a distinctive silvery white mark resembling letter
gamma. Hindwings yellow, with a wide black border. Thorax hairy with some tufts of hair. Proboscis well developed.
S. ain is a daytime flier, on the wings from July to August, depending on location. Larvae green, with yellowish longitudinal and double dorsal lines. They feed on
Larix species. Pupa dark brown. ==Distribution and habitat==