88 AMERICAN ORNITHOLOGY. 



NESTING HABITS. 



These birds are usually met with in the tree tops and they also build 

 their nests at high elevations from the ground. Consequently they are 

 quite difficult to locate, and are not often seen in collections. The 

 nests are placed on horizontal branches usually in a fork; They are 

 small and compactly made of strips of bark and grasses lined with 

 finer grass or horse hair. Their four eggs are white, sparingly 

 specked with reddish brown. 



HABITS. 



The little sky blue creatures are also known as Azure Warblers. 

 From their habit of keeping in the tops of the trees, where they feed 

 upon small insects, they are rarely known by the masses of even bird 

 lovers in the localities where they are most abundant. Their song is a 

 high-keyed and rather faint "zeep-zeep" repeated several times and 

 coming from the tree tops is barely noticable to an observer below. 

 My personal experience with these beautiful creatures is limited to not 

 more than three individuals that I observed in Rhode Island about ten 

 miles below Providence. Here they were found in tall trees in the depths 

 of a swamp and could not possibly have been identified without a gun 

 or powerful field glasses. I have never found their nest, although as 

 this was in July there is little doubt but what they were breeding there. 



CHESTNUT^SIDED WARBLER. 



A. <). U. Xo. 659. (Ueudroica pensylvanica). 



RANGE. 



United States east of the Mississippi and in southern Canada. 

 South of Pennsylvania they are found breeding only in the Alleghanies. 

 Their winter range is in Central America from Mexico to the Isthmus. 



DESCRIPTION. 



Length 5 inches. Adults may always be recognized by the yellow 

 crown and chestnut stripe on the sides. Voung birds and adults in 

 winter plumage are plain greenish vellow above and white below with 

 no black or chestnut markings. 



