210 Trans. Acad. Sci. of St. Louis. 



*628. VIREO FLAVIFRONS Vieill. Yellow-throated Vireo. 



Muscicapa sylvicola. Lanivireo flavifrons. 



Geog. Dist. Eastern United States and southern Canada, 

 north to Maine, Vermont, northern New York, southern Ontario 

 and Manitoba; west to the edge of the Plains; breeds from 

 northern Florida and southern Texas northward and winters 

 from southern Florida and Cuba south through eastern Mexico 

 and Central America to Colombia. 



In Missouri a common and generally distributed summer resi- 

 dent in all wooded districts. It is the first of the Vireos to ar- 

 rive in the state, having been heard as early as March 30, 1896, 

 in the southeast. In the region of St. Louis it may be looked 

 for between April 15 and 20 with much certainty; earliest date, 

 April 13, 1887; latest, April 27. The return movement from 

 more northern breeding grounds takes place in September, when 

 it is for a while more conspicuous than ordinarily. Its song has 

 been heard every day from September 1 to 9, and at intervals 

 throughout the month September 28, 1895, September 29, 

 1905, October 1, 1887, October 2, 1906. Last individuals are 

 noted as late as October 11, 1887, and October 12, 1895, at St. 

 Louis, and October 17, 1903, at Monteer, Shannon Co., by Mr. 

 Savage, but the bulk of the species leaves us from about Sep- 

 tember 22 to 25. 



629. VIREO SOLITARIUS (Wils.). Blue-headed Vireo. 



Muscicapa solitaria. Lanivireo solitarius. Solitary Vireo. 



Geog. Dist. Eastern North America; north to Prince Ed- 

 ward Island, Keewatin, Athabasca, southern Mackenzie; west 

 to border of Plains; breeds from southern New England, Penn- 

 sylvania, Wisconsin and northern Dakota northward, and win- 

 ters from the Gulf coast (Florida to Texas) southward to Cuba, 

 eastern Mexico and Guatemala. 



In Missouri a regular and fairly common transient visitant, 

 passing through rather late in both seasons. Earliest date at 

 St. Louis is April 21, 1896, and April 22, 1879, but the majority 

 of dates of "firsts" are between April 29 and May 5. Their stay 

 with us lasts about two weeks, May 10 to May 16 being the dates 

 for birds last seen (May 17, 1907, St. Louis). These dates seem 

 to hold good also for the western part of the state (May 15, 

 1899, Independence, Tindall; May 7, 1874, Warrensburg, Scott). 

 In fall their presence extends over a period of at least four 



