MICHIGAN ACADEMY OF SCIENCE. 89 



days. From August 18 to 22 many small flocks were observed, mainly 

 in the hemlocks. On July 17, a nest of this species was found by watching 

 a female carry food to the young. The nest was situated about thirty feet 

 from the ground in a small hemlock in the hemlock and birch forest, and 

 contained three very young birds. 



70. Dendroica virens. Black-throated Green Warbler. — In July this bird 

 was noted but once — on the twenty-third when an adult female was taken 

 in the hardwood forest. On August 3 and 4, several small flocks were ob- 

 served feeding in the hardwood forest. On the eleventh, small flocks be- 

 came frequent in the river thickets, and from that date the species was 

 noted in numbers daily. 



71. Seiurus aurocapillus. Oven-bird. — An adult male taken July 8 was 

 the first record for the species. From that date the birds were frequently 

 seen and heard singing in the lower, damper areas of the hardwood forest 

 until the first week in August, when most of them disappeared. 



72. Seiurus noveboracensis notabilis. Grinnell's Water-thrush. — This 

 species was frequently observed during the first two weeks of July. After 

 the sixteenth, it rapidly decreased in numbers, and was recorded but once 

 in August — a young male being taken on the twelfth of that month. All 

 along the rivers where the dense tangled thickets came to the water's edge, 

 or where there were tangled piles of driftwood, this species was sure to be 

 seen slipping about in its shy, secretive manner. Rarely males were heard 

 in full song. On several occasions birds were seen to carry food as if feeding 

 young birds, but no nests were found. 



73. Oporomis Philadelphia. Mourning Warbler. — This species was first 

 recorded on July 14 in a willow thicket on a little tributary of the river. 

 The male was in full song when first seen, and from his actions had a nest 

 nearby. Three days later a pair were observed in a dense thicket on a 

 hillside on the Foster City road. Another male was noted near this 

 place. The species was seen several times in August, and the last bird was 

 observed just before we left camp, on the twenty-fourth. 



74. Geothlypis trichas trichas. Maryland Yellow-throat. — This species 

 was not common in the region, and was mostly confined to the river thickets 

 and the willows in the beaver meadow. By the end of July it had practically 

 disappeared, altho on August 5 twenty or more birds were noted along the 

 Foster City trail — as many individuals as were seen all the rest of the time 

 in the field — but these had all gone on the next day. On July 12 a family 

 of four young birds just able to feebly flutter about was found in a thicket 

 near Jackson Lake. 



75. Wilsonia canadensis. Canada Warbler. — At least a few of these war- 

 blers bred about Brown Lake. On July 4 a male and a female were seen in 

 a cedar swamp near the river. The latter was several times seen bearing 

 food in her bill as if bound for a nest. This pair was seen several times 

 subsequently. On July 21 another male was seen, and in August a few 

 ])irds were observed almost daily along the watercourses until the twelfth. 



76. Setophaga ruticilla. Redstart. — This species was quite frequently 

 recorded during July, and l)ecame common about August 4. It was typically 

 an inhabitant of the river thickets, but was occasionally noted in the edge 

 of the forest. During the first two weeks of August, numerous flocks were 

 observed often in the the same localities in which the birds had nested and 

 fed during the summer. On August 24, the date of the conclusion of field 

 work, the species was still common. The species undoubtedly bred in the 

 region. (See cowbird). 



