私たちは，新潟市関屋海岸の一画において1987年秋以来20年以上にわたって鳥類の標識調査を実施してきた．この過程で，季節的移動を繰り返す邦産ウグイス（大多数が亜種ウグイスCettia diphone cantansで，亜種カラフトウグイスC. d. sakhalinensisが含まれている可能性もある）の個体数変動や移動時期の性差および移動先などについて明らかにすることができた（小松・千葉 1999，Komatsu et al. 2004）．標識・放鳥された14,000羽を越すこれら邦産ウグイス個体群中に，外部形態の特徴から，別亜種チョウセンウグイス（C. d. borealis）と同定し得る2個体（雌雄成鳥各1羽）が含まれていることに気づいた．そこで，これらの計測値と外形写真を紹介し，過去の捕獲事例との比較結果を報告する．

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2006年1月1日から12月31日までの一年間に実施された標識調査の新放鳥数を県別に集計した．集計に際しては，山階鳥類研究所標識研究室の資料を用いた．図1に各都道府県別の新放鳥数と新放鳥種数を，表に各種別の放鳥数を示した．

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Pintail Snipe Gallinago stenura breed over a wide area from Tibet north across the Siberian tundra, and east as far as the trans-Baikal; and winter south along the Korean Peninsula to China and peninsular and island Southeast Asia. In Japan they have been occasionally recorded as accidental visitors, primarily along the Pacific Ocean side of the islands. This research reports three observations of Pintail Snipe in rice paddies in Niigata Prefecture, along the Sea of Japan side of central Honshu. The first observation, made on 19 Feb 2009, was of a single Pintail Snipe mixed in with a flock of seven Common Snipe G. gallinago (Fig 1). Compared to that of the Common Snipe, the bill of the Pintail Snipe is shorter, and thicker at the base. The tail is also shorter. The second observation, recorded on 28 Feb 2009, was of three Pintail Snipe mixed in a flock of five Common Snipe. The third observation, on 1 March 2009, was of three Pintail Snipe individuals feeding alone. The rice paddies in which these observations were made ranged from one to three kilometers inland from the coast, which raises the possibility that these Pintail Snipe are not just visitors accidently blown here. Perhaps, due to global warming or some combination of various changing environmental factors, small numbers of Pintail Snipe may actually be beginning to winter in central Honshu. In the future, researchers and observers should keep a sharp lookout for Pintail Snipe, as more observations are required to ascertain whether or not these birds have begun to winter here.

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