Thirty-three butterfly species were collected in July 1993 from Sebesi and Sebuku Islands, Indonesia. Most of them were identified at the subspecies level, except several lycaenids. Fourteen species (42.4%) out of the 33 have never been recorded from the Krakataus. This proportion is distinctly higher than 4 to 8 (13.3 to 26.7%) of 30 species recorded from Sebesi in 1989. When these data were taken together, the percentage becomes 32.7 to 40.4% (17 to 21 of 52 species recorded from

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... ). Comparison between Javanese and Sumatran subspecies in the rate of common species on Sebesi-Sebuku and the Krakataus indicates that the butterfly fauna of the Krakataus have been chiefly derived from Java rather than from Sumatra even though the 2 stepping-stone islands exist between the Krakataus and Sumatra.