228 Trans. Acad. Sci. of St. Louis. 



Hudson Bay region and northwest to Alaska. Breeds from 

 northern New England and New York, northern Michigan and 

 Manitoba northward, also near Manitou, Colo., and in Montana 

 and probably Wyoming. Winters in northern South America, 

 east to French Guiana and Para, west to Ecuador; south as 

 far as Rio Negro in Brazil. Migrates by way of Bahamas and 

 West Indies; no record from Mexico and Central America. 



In Missouri one of the most regular and most numerous tran- 

 sient warblers in spring, less common in fall, when easily over- 

 looked, because silent, plainly garbed and slow in its movements. 

 St. Louis can expect to greet the first Black-poll April 29, and 

 judging from reports from Kansas City (April 28, 1904) and from 

 Independence (April 27, 1900), the army of north-going Black- 

 polls begins to invade the southern part of the state generally 

 the last days of April. They become more numerous after the 

 first of May and the bulk is present during the second, in northern 

 Missouri, during the third week in May. They are much oftener 

 heard than seen, uttering a peculiarly grating song, while creep- 

 ing along branches in the highest trees. Their song is heard 

 during the first half of May almost everywhere, wherever there 

 are trees. By the middle of May the singing males have usually 

 passed on and silent females only are met with. In cool weather 

 the departure is delayed and Black-polls have been noted at 

 St. Louis as late as May 29, 1882, and at Keokuk, June 2, 1901, 

 but they are always rare after May 20, except in the cold spring 

 of 1907, when unusually abundant at St. Louis from May 10 to 

 June 6. In fall their passage through Missouri takes place in 

 September, chiefly the latter part, and during the first week of 

 October, when on some days they occur in regular flocks. 



662. DENDROICA BLACKBURNIAE (Gmel.). Blackburnian War- 

 bler. 



Sylvia blackburniae. Sylvicola blackburniae. Sylvia pants. Sylvicola parus. 



Geog. Dist. Eastern North America, north to Maine, Nova 

 Scotia, southern shores of Hudson Bay, northern Ontario, Mani- 

 toba, west to edge of Great Plains. Breeds from southern 

 Alleghanies, Connecticut, New York, Pennsylvania, Michigan, 

 Wisconsin and northern Minnesota northward. Winters chiefly 

 in South America from Colombia to Peru. 



In Missouri generally a rather rare transient visitant, but 

 found in all parts of the state, though more frequently eastward. 



