Harris—Birds of the Kansas City Region. 319 
than seen, and during their silence after the breeding season 
are often overlooked. 
They are to be looked for in thick bottom timber. Several 
pairs nest regularly in the damp woods of Shilo Hollow and 
Hazel Dell, in Swope Park. They also breed in the Missouri 
Valley. 
The song is similar to one form of the Parula Warbler’s song 
but may be distinguished by its opening, which consists of a 
series of double notes briskly given. The two are often heard 
together in the woods near the south suspension bridge across 
the Blue River in Swope Park. 
DENDROICA PENSYLVANICA (Linn.). Chestnut-sided Warbler. 
Very rare migrant. 
There are but eight available records of the occurrence of 
this warbler in Jackson County. It was observed on April 30th 
during two years and from the 13th to 20th of May during five 
others. No autumn records are available. 
DENDROICA CASTANEA (Wilson). Bay-breasted Warbler. 
Very rare migrant. 
This warbler has been reported as rare both to the east and 
west of this district and there is but a single local record, of 
ancient origin (Hoy). Students should be on the lookout for 
further records. 
Denproica striata (J. R. Forster). Black-poll Warbler. 
Common migrant. 
The Black-poll brings up the rear of the north-bound warb- 
ler army and is commonest during the second and third weeks 
of May. The advance guard usually arrives between the 2nd 
and 7th of May though in favorable seasons it may arrive 
earlier (April 27, 1900, April 28, 1904, April 29, 1915, earliest). 
The southward flight passes during September. 
The Black-poll Warblers may be looked for in all wooded 
Sections of the county and in the park cemeteries. 
Denproica rusca (Muller). Blackburnian Warbler. 
Rather rare migrant. 
Blackburnian Warblers appear about the end of the first 
week in May and are rarely seen after the 20th (an exception- 
ally late date is May 30, 1904). They pass through on the re- 
