314 Trans. Acad. Sci. of St. Louis. 



This species is not so closely associated with thick woods as 

 most of the other vireos and may be found on the prairie re- 

 gions in thickets, hedges, bushes and small clumps of trees or 

 shrubbery. It nests in the outskirts of the city and may be 

 found in the neighborhood of Swope Park as well as other 

 easily accessible places further west and south. It nests early 

 in June. 



Family MNIOTILTIDAE. Wood Warblers. 



MNIOTILTA VARIA (Linn.). Black and White Warbler. 

 Common migrant and rather rare summer resident. 



The Black and White Warbler arrives from the 15th to 20th 

 of April (April 11, 1915, earliest) and is very common in the 

 wooded sections of the county until the middle of May. From 

 then on until the first week in September only the breeding 

 birds are present. During the first two weeks of September 

 the migrants are again numerous. 



This distinctively marked warbler breeds in the less fre- 

 quented sections of Swope Park where it has been observed car- 

 rying nesting material and feeding full grown young. Unlike 

 most of the warblers it often feeds near the ground on the 

 trunks of trees and among low bushes and is easy of approach. 



During the spring migration, when the birds are mating, 

 they are seen in numbers in wooded territory over the entire 

 county, particularly in Swope Park. 



PROTHONOTARIA CITREA (Boddaert). Prothonotary Warbler. 

 Common summer resident. 



The Prothonotary Warbler arrives irregularly from the mid- 

 dle to last of April (April 7, earliest) and leaves during the 

 first half of September. 



It nests in holes and cavities and prefers to be near water. 

 It breeds along the Blue in the Swope Park district and is com- 

 mon in the Missouri bottom timber near swampy and damp 

 places. Deserted woodpecker holes in standing dead trees or 

 stumps are favorite nesting sites. 



Great numbers migrate up and down the Missouri Valley. 



HELMITHEROS VERMIVORUS (Gmelin). Worm-eating Warbler. 

 Not uncommon summer resident. 



The Worm-eating Warbler arrives during the first few days 



