Euploea is a genus of milkweed butterflies. The species are generally dark in coloration, often quite blackish, for which reason they are commonly called crows. As usual for their subfamily, they are poisonous due to feeding on milkweeds and other toxic plants as caterpillars. The latter are aposematically colored to warn off predators from eating them, and the adult butterflies are often mimicked by unrelated species which are not or less poisonous.

This genus has a large number of junior synonyms, due in part to Moore committing what probably ranks as one of the most drastic cases of oversplitting in the history of zoology: Crastia Hübner, 1816 Trepsichrois Hübner, 1816 Salpinx Hübner, 1819 Eudaemon Billberg, 1820 Terpsichrois Hübner, 1821 (lapsus) Euplaea Boisduval, 1832 (lapsus) Calliploea Butler, 1875 Macroploea Butler, 1878 Stictoploea Butler, 1878 Euplea W.F. Kirby, 1879 (lapsus) Adigama Moore, 1880 Andasena Moore, 1883 Betanga Moore, 1883 Bibisana Moore, 1883 Chanapa Moore, 1883 Chirosa Moore, 1883 Danisepa Moore, 1883 Deragena Moore, 1883 Gamatoba Moore, 1883 Glinama Moore, 1883 Hirdapa Moore, 1883 Isamia Moore, 1883 Karadira Moore, 1883 Lontara Moore, 1883 Mahintha Moore, 1883 Menama Moore, 1883 Mestapra Moore, 1883 Nacamsa Moore, 1883 Narmada Moore, 1880 Nipara Moore, 1883 Oranasma Moore, 1883 Pademma Moore, 1883 Patosa Moore, 1883 Penoa Moore, 1883 Pramasa Moore, 1883 Pramesta Moore, 1883 Rasuma Moore, 1883 Sabanosa Moore, 1883 Saphara Moore, 1883 Sarobia Moore, 1883 Satanga Moore, 1883 Selinda Moore, 1883 Tabada Moore, 1883 Tagata Moore, 1883 Tiruna Moore, 1883 Tronga Moore, 1883 Vadebra Moore, 1883 Vonona Moore, 1883 Anadara Moore, 1883 (non Gray, 1847: preoccupied) Doricha Moore, 1883 (non Reichenbach, 1853: preoccupied) Karadina Moore, 1891 (lapsus) Chirosia Sharp, 1904 (lapsus) Daniseppa Fruhstorfer, 1910 (lapsus) Pamasa Fruhstorfer, 1910 (lapsus) Rausuma Fruhstorfer, 1910 (lapsus) Ironga Martin, 1914 (lapsus) Makroploea Martin, 1915 (lapsus) Eupolea Hulstaert, 1931 (lapsus) Ramasa Hulstaert, 1931 (lapsus)