The Formosan species described in this paper is allied to Argyresthia andereggiella (DUPONCHEL), occurring in Europe, Siberia and Japan, but is apparently distinct from it in the following points : noticeably larger, measuring 14mm across the forewing as compared with 9-11mm, the lack of two fasciae on the forewing, and darker in the colour of markings; on the male genitalia, the valva ovate instead of elongate-ovate in shape, and the aedeagus shorter and twice the length of the valva, whereas about three times in andereggiella, etc.
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