Abstract
Mugimaki Flycatcher breeds in Sakhalin and Siberia and winters in southern Asia, passing Japan as a transient. Udagawa considered it an autumn migrant, which occurs only as stragglers in spring (May and March, the latter being doubtful and his theory of correlation with snow line is not tenable). The author adds five spring records (May) from Hokkaido, Honshiu and S. Korea, which prove its regular passage in this season, though less notice than in autumn, when it moves slowly in broad front with its number multiplied by young birds. Birds might stop and breed if they found a suitable breeding environment before reaching finar destination. Udagawa's late May observation of a pair in Fuji Mt., Honshin, might be such an example. Suggestion is given of its migration routes.
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