248 _ THE AMERICAN MIDLAND NATURALIST. 
nests commonly in the vicinities of Charles City, Rockford, 
Nora Springs and Osage, the eggs being laid in late May or 
the first week in June. It is commonly selected by the cow- 
bird as a host. 
188. Dendroica caerulescens caerulescens (Gmel.) Black- 
throated Blue Warbler. A rare migrant in Floyd County, and 
so reported by Mrs. Tuttle for Mitchell. A flock of three, two 
males and the third probably a female, were seen at “Big 
Springs,” north of Floyd, on May 20, 1918. 
189. Dendroica coronata (Linn.) Myrtle Warbler. An 
abundant migrant, arriving as early as April 10. It reaches 
its height about a week after the first arrival, and remains 
until about May 15. The southward.migration takes place 
in October. 
During the spring these birds are to be met with almost 
everywhere, both in town and in the country woodlands. They 
flock about door-yards, in the parks, and along the streams. 
Flocks of some hundreds (estimated 400 to 600) have been 
seen at Willow Pond and in the immediate neighborhood. 
During the autumn migration they are less conspicuous, and 
travel in smaller flocks. ; 
190. Dendroica magnolia Wilson. Magnolia Warbler. 
The Magnolia Warbler is a common migrant in Floyd, Mitchell 
and Cerro Gordo counties. The earliest arrival date recorded 
is for Charles City, April 23, 1916, when Howard Clark Brown 
and I saw a small flock. The height of the migration follows 
about a week after the first arrivals are noted. In 1918 the 
migration of these Warblers was delayed, my first record 
being for May 3. 
191. Dendroica cerulea (Wilson.) Cerulean Warbler. A 
common migrant about Charles City and Nora Springs, proba- 
bly throughout the county. Arrives May 2 to 12, and associ- 
ates in flocks with the two preceding species. 
192. Dendroica pennsylvanica (Linn.) Chestnut-sided 
Warbler. An uncommon migrant. I noted seven-individuals 
north of Floyd on May 20, 1918. Brown lists it as rare, 
giving as the only Willow Pond record one for May 16, 1917. 
I have not seen the species during its autumn migration. 
193. Dendroica striata (Forster.) | Black-poll Warbler. 
