Abstract
The smaller tea tortrix (Adoxophyes fasciata WALSINGHAM) and the summer fruit tortrix (A. orana FISCHER VON ROSLERSTAMM) are closely related species. Of the two, only A. orana has been recorded from Hokkaido and the cooler northern and central montane areas of Honshu, however both species occur sympatrically in the warmer parts of Honshu, Shikoku and Kyushu. Thus, there is no geographic isolation between the two species. In the sympatric area, there is no evidence of hybridization, even though habitant isolation due to different preferences for food plants is not complete. It is therefore probable that other isolating factors exist which are responsible for this situation.

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