Turdus u.swainsonii. copy 6 Upper Megalloway River, Maine. 1898. (Camping on the river bank) At daybreak this morning a Sept.20. small party of Thrushes circled over us and finally pitched down near the tents. The experience of the past four weeks has convinced me that the nocturnal flight calls of the Rose- breasted Grosbeak and the Swainson's Thrush are practically indistinguishable. Early in September I heard Grosbeaks come over Pine Point and alight near my tent gradually changing the night call into one of the diagnostic day notes. One of the Thrushes heard this morning changed the same call in the same way into the unmistakable t' chur-r-r of Turdus swainsoni.