The Parnassiinae or Snow Apollos are a subfamily of the Papilionidae or Swallowtail family. The subfamily includes about 50 medium-sized, white or yellow species. The Snow Apollos are high altitude butterflies and are distributed across Asia, Europe and North America.The tribes recognized in the Parnassinae are Parnassiini, Zerynthiini and the Luehdorfiini.