It was treated as “No. 338-3. Subsp. C. d. borearis. Chosen-uguisu” on the list. The record of No. 346. Phylloscopus schwarzi. Radde's Warbler. Karafuto-mujisekka from Yaeyama could be confused with this bird.
Status: Straggler or locally winter visitor.
Record: The BL has no record for the species from Japan. Iozawa has recorded several birds in the winter on Yonaguni since 1989.
