222 Trans. Acad. Sci. of St. Louis. 



*652. Dendroica aestiva (Gmel.). Yellow Warbler. 



Motacilla aestiva. Sylvia aestiva. Sylvicola aesitva. Sylvia citrinella. 

 Sylvia childrenii. Sylvia rathbonia. Sylvia trochilus. Wild Canary, 

 Yellowbird. Blue-eyed Warbler. 



Geog. Dist. — North America in general (except Alaska and 

 northern Pacific coast where subspecies, ruhiginosa, and south- 

 western United States where subspecies, sonorana). Breeds 

 nearly throughout its range except Florida and southern Georgia. 

 Winters in Central and South America going as far south as 

 7° S. in western Peru. 



In Missouri a fairly common summer resident in all settled 

 districts, but not in the forest or far away from water; other- 

 wise of general distribution in all regions. The third week of 

 April is the time for the arrival of the first Yellow Warblers 

 in the vicinity of St. Louis; in more southern parts a few days 

 earlier (April 13, 1893, at Hornersville), in the northern from 

 five to ten days later, but on the whole there is a great regularity 

 in their appearance. As with most other birds the first comers 

 are old males in full song, followed a few days later by their 

 mates. Numerous transients are present during the last days 

 of April and the first half of May when the species is one of the 

 most conspicuous songsters about our country homes. Its 

 song is heard until the middle of July, when the species disap- 

 pears from the breeding ground, apparently retiring southward, 

 but at the border of lakes and. rivers we sometimes meet a few 

 transients during August, very rarely in September. Latest 

 record, September 17, 1885, Mt. Carmel, Mrs. Musick. 



654. Dendroica caerulescens (Gmel.). Black-throated Blue 

 Warbler. 



Sylvia canadensis. Sylvicola canadensis. Dendroeca canadensis. Sylvia 

 caerulescens. Sylvia pusilla. Sylvia leucoptera. Vireo sphagnosa. 



Geog. Dist. — Eastern North America, breeding from north- 

 eastern Connecticut, mountains of Pennsylvania, northern On- 

 tario, southern Michigan, and Minnesota northward to New- 

 foundland, Labrador and shores of Hudson Bay. During mi- 

 gration westward to base of Rocky Mountains in Colorado 

 and New Mexico. Winters in the West Indies and northern 

 South America. 



In Missouri a rare transient visitant, less so in the east than in 

 the west, where records are very few. Dr. Hoy mentions it in 



