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Butterflies No. 20 (Aug. 31, 1998), The Butterfly Society of Japan

• Harada, M. Apatura iris: 2-3
• Murata, Y. Notes on the evolutionary process of butterflies and butterfly fossils (Part 1): 4-17
• Ohya, T. A Revision of birdwing butterflies Series I (Genus Ornithoptera) Part 2 (4) (Subgenus Ornithoptera: 18-29
• Kimura, Y. Poritiinae in Thailand (I): 30-39
• Yokochi, T. Designation of lectotype of Euthalia group (Rhopalocera, Nymphalidae) preserved in The Senckenberg Museum, Frankfurt am Main: 40-44
• Yoshimoto, H. Papilio bianor and Papilio dehaanii, two distinct species:45-49
• Hara M. Karakoram areas trip ended with the tragic results; Boulder flow broke down the Karakorum Highway: 50-57
• Hoshiai A. & K. Rose. A description of a new subspecies of Colias nebulosa Oberthur, 1894 (Lepidoptera, Pieridae): 58-61
• Asano T. & H. Ogura. Early stage of Melanargia epimede in Beijing, China; Correction and Additional information: 62-63