鳥体の大きさは翼長,尾長,〓蹠長,嘴峰長などで表わされる。筆者らは変異を明らかにする目的で農林省鳥獣実験場構内で捕獲されたスズメ成鳥400以上におよぶ個体を測定した。その結果翼長の範囲は61.0～73.0mmが記録された。平均値は67.66×0.25mmが推定され,その頻度分布は正規分布に近い。尾長は50.0～59.0mm,〓蹠長は15.0～19.0mm,嘴峰長は9.0～12.0mm,体重は18.0～27.5gの範囲であった。翼長と各部測定値との相関は尾長が高いが,他は極めて低い。各部の測定値の頻度分布は一山形の連続分布をするので雌雄の判別は不可能である。解剖によって確めた雌6,雄4個体の各部の測定値の平均は各部とも雄は雌よりも大きい傾向にあった。

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Body weights in E. r. latifascia and A. a. orientalis increase in premigration periods. Body weights in E. r. latifascia and P. m. saturatus also increase in winter. Body weight and lipid in L. fasciolata do not differ significantly in both periods of spring and autumnal migration.
Liver weights in A. a. orientalis and E. r. latifascia increase in premigration period. Thus the high metabolism of lipid in liver appears in premigration period.
Melting point of lipids in A. a. orientalis and E. r. latifascia decrease in premigration periods which suggests the increase of unsaturated fatty acids in lipid. Iodine values in A. a. orientalis and E. r. latifascia increase in molting period and slightly decrease in premigration period. Saponification values in A. a. orientalis and E. r. latifascia gradually increase in premigration period. Saponification values in E. r. latifascia and P. m. saturatus increase in winter. The value of subcutaneous lipid in E. r. latifascia is higher than that of the body lipid, while in P. m. saturatus does not differ significantly.
Fatty acid composition of lipid in several passerine birds mainly consist of oleic acid and palmitic acid. Fatty acid composition in E. r. latifascia tends to increase in unsaturated fatty acid from midwinter to premigration period.
Food intake in caged E. r. latifascia increases in winter and becomes more intense in spring, while it increases in winter and breeding season in P. m. saturatus.
Zugunruhe in E. r. latifascia appears in late April and early May and lasts approximately one and a half month or slightly longer. The duration of Zugunruhe may not be fixed in the species, but may be changeable to the physiological and ecological conditions.
A working hypothesis can be proposed for the spring migration.

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本篇には淡水鴨類の残り7種,即ちトモエガモ,ヨシガモ,ヒドリガモ,アメリカヒドリ,オナガガモ,シマアジ及びハシビロガモ,並びにオシドリについて表記した。

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第4篇即ち本調査の最終篇で,これには潜水鴨類即ち新加入アカハシハジロからコケフタガモに至る14種と秋沙類のミコアイサ,ウミアイサ及びカワアイサの3種の分布地表を出してひとまず完了とする。

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A new record of Erithaus sibilaus from Sado Is. On 18 May 1969, a female bird of this species was obtained by the author on the police office in Riyoutsu City Niigata Prefecture. By Akira Matsunaga observed Fregata ariel at Yonuyama big bridge neighbourhood in Kashiwazaki, Niigata Prefecture.

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The present article contains new American names proposed by Mrs. de Schauensee and Eisenmann in 1966, with the Japanese names appeared in Kuroda's Psittacidae of the World (1967) for comparison.

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