RARER BIRDS OF AMES REGION 
221 
notes were made I have been inclined to discredit the determina- 
tion, since no subsequent records were obtained. 
Chestnut-sided Warbler 
( Dendroica pennsylvanica) 
The chestnut-sided warbler is seldom seen at Ames. Two re- 
cords for it were obtained; 1, May 27, 1917, and 1, June 3, 1917. 
This warbler is said to be a common summer resident in south- 
eastern Minnesota. 
Bay-breasted Warbler 
{Dendroica castanea) 
A single record was obtained, three being seen May 27, 1917. 
This warbler is a common transient visitor only in certain 
favorably situated places in the northern states. In southeastern 
Minnesota it is uncommon. Speaking of this warbler Chapman 
says : “Although close observation will reveal the presence of 
Bay-breasts during both the spring and fall migrations, they are 
generally to be classed among the rarer warblers the mere sight 
of which is stimulating.” 
Mourning Warbler 
{O p or ornis Philadelphia) 
The mourning warbler is said by Chapman, “to be a more or 
less rare bird throughout its range,” and according to Brewster 
there are definite records of but fifteen individuals at Cam- 
bridge — this statement being made a number of years ago. It 
is one of the very latest of our birds to arrive in the spring. The 
scarcity of records may be in part due to this fact, many observers 
frequently stopping their migration records before the species 
arrives. On May 22, 1920, I observed four males in the woods 
north of town. They were studied at a range of only twenty 
to thirty feet. The day was “partly cloudy” and there was a 
strong southwest wind. 
Winter Wren 
{N annus hiemalis hiemalis) 
Some might consider the winter wren a common bird at Ames. 
Six records are here given for it; 1, April 14, 1915 (B. R. E.) ; 
1, April 15, 1917; 1, April 22, 1917 (B. R. E.) ; 1, April 21, 1918; 
2, March 28, 1919; 2, March 28, 1920 (B. R. E.). 
