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THE BIRDS OF WISCONSIN. 
Dendroica pensylvamica ([Ann.). CHESTNUT-SIDED WARBLER, 
An abundant migrant and common summer resident. In 
the migrations this warbler is found everywhere, but during the 
summer it prefers the open clearings that have grown up 
thickly with brush of all kinds, particularly hazel and oak 
scrubs. It frequently becomes the foster parent of the cowbird. 
This elegant species seems fully as plenty as thirty-five years 
ago. 
Dendroica fastauea (Wils.J. BAY-BREASTED WARBLER. 
A common migrant, especially in the fall. At this season 
it sometimes outnumbers all other species. In Jefferson 
County young have been taken by the middle of August, and 
we have suspected that some, at least, nest in the extreme 
northern part of the state, as is surely the case in the northern 
peninsula of Michigan. An authentic Wisconsin nesting 
record is, however, yet to be obtained. Some observers report 
this species as rare, and even absent from certain sections, 
which it seems must be entirely the fault of the observer. The 
young in the fall are often confounded with the next. The 
height of the spring migration in southern Wisconsin ranges 
from May 10 to May 20, according to the season, and in 
autumn is from the last days of August to the middle of Sep- 
tember. Apparently more common along Lake Michigan 
than in the interior. Belated individuals have been shot in 
Jefferson County as late as June 10. 
Dendroica striata (Forst.J. BLACK-POLL WARBLER. 
Usually the last of the genus to arrive in spring, it is some- 
times well toward the end of May when the black-poll becomes 
abundant. Returning it is common again during the latter 
half of September and well into October. So far as our records 
show, it is a common migrant in all parts of the state. There 
is no authentic nesting record of the species, but it has been 
noted in the northern counties in June and July, and no doubt 
a few breed within our borders. 
Dendroica blaekonrnia* (Gmel.J. BLACKBLRNIAN WARBLER. 
An abundant migrant, arriving with the warbler host early 
in May. A few nest regularly in the state, even in the south- 
ern counties, most often in the tamarack swamps. Eggs have 
been taken in Jefferson County and young in Manitowoc 
County (L. K.). Mr. J. N. Clark, of Meridian, writes of this 
species, and the warblers in general : "Our warblers of every 
