52 NOKTH AMERICAN WAKBLERS. 



species struck the Sombrero Ke}^ lighthouse October 7 and 8, 1886, 

 and October 7, 1887. Some very early dates of striking are Septem- 

 ber 17 and 18, 1887. The heaviest flights noted occurred October 16 

 and 17, 1887. On these two nights about '50 individuals altogether 

 struck the light, and 6 were killed. 



In the latitude of Washington and St. Louis the last fall migrants 

 are seen about October 7-12, and at Key West the latest reported 

 passed southward November 1, 1887. The latest date of striking at 

 Sombrero Key lighthouse is November -l, 1887. The Fowe}- Rocks 

 lighthouse, on the southeast coast of Florida, in line with migration 

 to the Bahamas, was struck November 1, 2, and 7, 1891. A belated 

 migrant was shot at Cleveland, Ohio, November 2, 1885. 



651. Dendroica olivacea (Giraud). Olive AVarbler. 



The olive warbler breeds in central Mexico and in southern Arizona 

 whence it retires in winter to Mexico where it occurs on the highlands 

 from 5,000 to 10,000 feet. It has also been taken in Guatemala from 

 6,000 to 10,000 feet. Possibly a few may winter in southern Arizona 

 where one was taken February 21. The arrival of the first was noted 

 April 6, 1902, in the Huachuca Mountaius, Arizona. 



652. Dendroica sestiva (Gmel.)- Yellow Warbler. 



Breeding range. — If a map of the United States and Canada south 

 of the Barren Grounds was colored to represent the breeding area of 

 the yellow warbler, the uncolored portions would comprise Florida, 

 southern Georgia, and numerous small 'islands' representing the 

 upper parts of the eastern mountains and such parts of the western 

 mountains as are above 6,000-8,000 feet. The summer range of the 

 bird, including the range of the subspecies sonorana in the southwest- 

 ern part of the United States and that of rubiginosa in Alaska, covers 

 approximately 40° of latitude — 30° to 70° — and 110° of longitude — 55° 

 to 165°. The winter range covers 31° of latitude— 21° N. to 7° S.— 

 and 54° of longitude — 52° to 106°. The two in combination thus give 

 an extension of 77° of latitude and 113° of longitude. 



The extreme points of the yellow warbler's range — northern Alaska 

 and western Peru — are farther separated than the extremes of the 

 range of the black-poll warbler, which is considered the greatest 

 migrant of the famil3^ Owing, however, to the southerly extension 

 of the breeding range of the former, it is likely that the longest 

 migration trips of black-polls exceed those made by an}^ yellow 

 warblers. 



Winter range. — The yellow warbler has been taken in central Peru 

 at La Merced ^^(2,600 feet), and at Iquitos^ in the extreme northeast- 



«Berlepsch and Stolzmann, P. Z. S., p. 331, 1896. 

 ^Taczanowski, Orn. Per., Ill, p. 507, 1886. 



