108 Tue Witson BuLLeTIN—No. 75. 
on the night of September 18, and on the morning of the 19th the 
species was very abundant. There must have been thousands of 
individuals about the light-house, where they fed partly on flies 
that collected on the window screens and sides of the house, and 
apparently also on ground insects, and possibly seeds of the beach 
grasses. Over the rest of the island they were rather generally 
distributed, but showed some preference for the open beaches and 
sand dunes. These birds all passed on during the next night, and 
on September 20, and afterward, only a few were seen until the 
night of October 5, when the largest wave of warblers and spar- 
rows reached the island. Among the birds in this movement there 
were thousands of this species and of the myrtle, and large nun- 
bers of black-throated blue, and black-throated green warblers, 
American redstarts, juncos, vesper sparrows, and a few horned 
larks. These all came about the light-house and buildings and lit 
on the ground, on the steps, window ledges and screens, where 
they soon devoured most of the numerous house flies. By October 
11 the palms had disappeared, with the exception of a yery few. 
But one fall record is known for Ann Arbor, October 1, 1896. 
138. (6783) Dendroica discolor, PRAIRIE WARBLER.—This war- 
bler was first seen on the morning of August 22, when seyeral 
were observed with Cape May warblers in small trees near the 
light-house. On August 24, the writer saw three more, the last 
found. 
1389. (674) Seiurus aurocapillus. OVEN-BIRD.—The — oyen-bird 
wis found on August 31, when the writer saw several along the 
path through the woods. It was not seen again until September 
5, and after this only occasionally until September 30, when the 
last one was noted. These birds were always on the ground under 
low bushes and tall ferns, and could only be seen by calling, when 
they would fiy up into a low tree or on a bare log, often coming 
within a few feet of the observer. 
140. (675a) Seiurus noveboracensis notabilis. GRINNELL’S WaA- 
TER-THRUSH.—What seemed to be a family of this species was 
found on August 17. The probabilities are that these were mi- 
grants. It breeds in the northern peninsula and migrates early, 
as it came to Sand Point on August 5, 1908, and was present there 
until August 14. The last one seen on Charity Island was on 
August 22. <All of the Michigan water-thrushes seem to belong to 
this sub-species, and it is doubtful if any typical noveboracensis 
are to be found in the Great Lakes region. On the other hand, 
many birds that are intermediate between the two forms are 
found, which seems to show that the forms intergrade near this 
region. 
