118 
THE BIRDS OF WISCONSIN. 
was placed on the ground in a dense thicket of hazel, briars, etc. 
Though the nest was not touched they abandoned it, but bred 
in the same thicket: the nest, however, could never be found. 
Has been found in the dense tamarack swamps of Jefferson 
County in Jul}', on several occasions, when it was, without 
question, nesting, and we have no doubt that a considerable 
number nest within the state. It is the very last warbler to 
pass northward in the spring. Many observers fail to find this 
species. Mr. Clark has not, as yet, taken it in Dunn County, 
and it was not found in the State by King, Grundtvig, or 
Willard. 
Oporoi-nis Philadelphia (Wils'.J. MOlRM\G WARBLER. 
Migrant. Of very similar habits to the preceding, 
frequents much the same localities, and. according to our 
observations, in about the same numbers. It arrives somewhat 
earlier in spring than agilis. In some years it is almost com- 
mon during the spring migration, for a few days, at Delavan 
and Lake Koshkonong. Reported by J. X. Clark from Dunn 
County, but not noted by King or Grundtvig. Dr. Hoy 
(Racine), and E. W. Xelson (northeastern Illinois), called it 
rare. By no means rare along Lake Michigan in migrations, 
especially in spring. Notwithstanding the general breeding 
range of the two species, as usually given in works of authority, 
we are of the opinion that this species never breeds in Wis- 
consin, although the other does, quite the opposite of the case, 
as usually given. We think any breeding record of this species 
for Wisconsin that may ever have been published, must 
surely refer to agilis. We cannot resist following Mr. Ridgway 
in including this species in the genus Oporornis. where it 
certainly appears to belong. 
Geothlypis trielias bracbidactyla (Swains.). NORTHERN YELLOW- 
THROAT. 
An abundant summer resident in all suitable localities, and 
especially numerous during the fall migrations, from the latter 
part of August until the middle of September. Mr. Wm. 
Brewster has examined our yellow-throats and writes us under 
date of July 31. 1902, as follows : "Despite the fact that Palmer 
calls the bird of the entire upper Mississippi Valley region, east 
of the 97th meridian, trickas, your specimens agree closely 
with his description of brachidactyla, and with my Xew 
