2S 'I'liK Wilson Bulletin — No. TO. 



noticed uii.v material increase of this species in the fall, when the 

 niiirrations are at their height. It therefore seems likel.v that the 

 hirds from further north move southward by way of the Marble- 

 head route. 



127. Empidonax flaviventris. — Yellow-bellied Flycatcher. 



Hardly more than casual for the Oberlin quadrangle, and usually 

 decidedly uncommon everywhere else. The first one was recorded 

 at Oak Point on May !), 1904. Other records are May 13, 1907, when 

 upwards of 20 individuals were recorded on the sand spit, Septem- 

 ber 23, 1907. one on the sand spit, and May 13, 16, and 26, 1908, 

 one eacli time on the sand spit. None were noted in 1909. A shai'p 

 lookout has been Icept for this species, and it is not likely that it has 

 been overlooked. It tlierefore seems certain that its migration route 

 passes west of this region. 



128. I'JmpidoiHi.f vire^ccufi. — Acadian Flycatcher. 



Conunon in the deeper woods over the whole region, except Cedar 

 Point and the smaller islands, where there are suitable habitats. 

 The median date of arrival is May 9, the earliest being Ma.v 4, 1899. 

 The latest fall record is September 21. 1906, when the bird was 

 singing. Its presence in the deep stream gorges has surprised me, 

 since its natural habitat seems to be rather dense beech woods. Its 

 rather loosely constructed nests are usually placed on the swaying 

 boughs of beech trees, from five to twenty feet up. Often interlac- 

 ing of branches afi'ord suitable nest sites. 



129. EnijddoiKi.r traiUii aJuorutn. — Alder Fl.vcatcher. 



There is a colony of some six pairs in each of three swamps at 

 Oalv Point, one of perha]is a dozen pairs at the mouth of Vermilion 

 River, one of about ten pairs at Ruggles Beach, between Huron and 

 Vermilion, and a considerable colony at the mouth of Huron River. 

 In the small marshes along the lake shore there are usuall.y to be 

 found one or more pairs of these flyca tellers. A pair regularly nests 

 among some water willows which grow on low ground along Plum 

 Creek in the outskirts of Oberlin. I found this flycatcher common 

 at the few suitable places on Middle Bass Island, but have not 

 noted it elsewhere among the islands. It has been found in the 

 borders of the marsh along the sand spit occasionally, but does not 

 nest there regularly, much to my surprise. I have little doubt that 

 it will be found on Pelee Island as a regular breeder. The median 

 date of arrival is May 14, the earliest being May 7, 1902 and 1904. 

 The latest one noted in fall was August 22. 1896, which is probably 

 a good deal too earl.v for the completion of the southward migra- 

 tion. Xests are built much like nests of the Yellow Warbler, but el- 



