The author has reported some notes on life-histories of 20 species of butterflies in Kannon district, North Formosa. Food-plants observed by him are as follows: Meneleides aristolochiae interpositus FRUHSTORFER: Byasa alcinous mansonenszs FRUHSTORFER: Aristolochia shzmadai HAYATA Papilio xuthus koxinga FRUHSTORFER: Princeps demoleus libanius FRHUSTORFER: Papilio polytes pasikrates FRUHSTORFER: Citrus grandis OSBECK, C. deliciosa TENOVE, C. Limon BURM f., Fagara nitida Roxs., F. cuspidata CHAMP. Papilio protenor amaura JORDAN : Citrus, Fagara nitida, F. cuspidata Papilio memnon heronus FRUHSTORFER: Citrus Papilio bianor takasago NAKAHARA et ESAKI: Citrus, Fagara ailanthoides ENGL. Eurema hecabe hobsoni BUTLER: Phyllanthus reticulatus POIR. Pieris rapae crucivora BOISDUVAL: Cruciferae Limnas chrysippus L. : Asclepias curassavica L. Salatura genutia CRAMER: Marsdenia tomentosa MORE. et DECNE. Vanessa cardui cardui L. : Gnaphalium japonicum THUNB., G. indicum L. Argyreus hyperbius hyperbius L. : Viola verecunda A. GRAY var. typica MAKINO Hypolimnas misippus L.: Portulaca oleracea L. Hypolimnas bolina kezia BUTLER: Ipomoea Batatas L. Precis almana L.: Bonnaya veronicaefolia SPRENG Precis orithya orithya L.: Justicia procumbens L. Ladoga sulpitia tricula FRUHSTORFER: Lonicera japonica THUNB. var. sempervillosa HAYATA Tacoraea perius perius L.: Glochidion Fortunei HANCE
