1913] 
Cahn: Birds of Waukesha County 
139 
Vireosylva philadelphica (Cassin). Philadelphia Vireo 
A common migrant, found usually early in May at about the 
height of the warbler migration. 
Vireosylva gilva gilva (Vieillot). Warbling Vireo 
A common migrant early in May, and so far as is known at 
present, not a breeding species. 
Lanivireo flavifrons (Vieillot). Yellow-Throated Vireo 
An abundant migrant, and occasionally a summer resident. 
Two nests were found near the entrance of the Oconomowoc 
River to Oconomowoc Lake in 1910, and several more near the 
same locality in 1912 and 1913. 
Lanivireo solitarius solitarius (Wilson). Blue-Headed Vireo 
A common migrant, rarely found later than the 20th of May. 
Mniotilta varia (Linnaeus). Black and White Warbler 
A very common migrant, often the second or third species of 
warbler to arrive. 
Protonotaria citrea (Boddaert). Prothonotary Warbler 
A regular migrant. On one occasion, at least, a summer resi- 
dent, but there is no reason to believe a breeding species. In 
June and July, 1911, a pair was seen on several occasions in the 
big swamp area near Golden Lake, and all search failed to reveal 
any sign of a nest. 
Vermivora chrysoptera (Linnaeus). Golden-Winged Warbler 
A regular, but rather uncommon migrant, arriving nearly at the 
height of the spring migration. 
Vermivora rubricapilla rubricapilla (Wilson). Nashville 
Warbler 
A common migrant. Is one of the early warblers to arrive, 
appearing early in May, and remains until the greater part of the 
warbler migration has passed. 
Vermivora peregrina (Wilson). Tennessee Warbler 
A common migrant, arriving late in the spring, and usually 
found after all other migrating warblers have passed northward. 
