Abstract
Mass migration of Kricogonia lyside (Pieridae) was observed in Santo Domingo, Dominican Republic, on September 16-17, 1995. According to my calculation, more than a million K. lyside moved from west to east for two days. The migration accompanied four other species: Phoebis sennae (Pieridae), Euptoieta hegesia, Euptoieta claudia (Nymphalidae) and Agraulis vanillae (Heliconiidae).