86 T^^OHTH AMERICAlSr WARBLERS. 



less common in Oaxaca and Chiapas. At this season a few birds 

 occur as far north as the lower Rio Grande. During the winter it is 

 commonly an inhabitant of the lower districts and the coasts, occur- 

 ring for the most part below 4,000 feet; but there are instances, pi'in- 

 cipally in the fall, of birds being seen several thousand feet higher. 



Sprmg migration. — At New Orleans the sycamore warbler is one of 

 the earliest spring migrants. Dates of arrival are March 11, 1891, 

 March 9, 1895, March 7, 1896, and March 12, 1898. The bird became 

 common by March 16, 1895, March 13, 1897, and March 19, 1898. At 

 Helena, Ark., the lirst arrivals were noted on April 14, 1895, and April 

 10, 1897; at St. Louis, April 1, 1881, April 6, 1885, April 12, 1886, 

 April 10, 1887, and April 13, 1888; in central Indiana about the middle 

 of April ; in southern Michigan about April 20. A migrant was noted 

 at Soto del Marina, Tamaulipas, March 1, 1902. The following Texas 

 dates of earliest arrival are, as usual, irregular: Hidalgo, March 6, 

 1891; Kockport, March 16, 1892; Refugio County, March 13, 1899; San 

 Antonio, April 9, 1889, March 31, 1890, April 19, 1891; Kerrville, 

 April 10, 1900, April 1, 1901; Dallas, March 12, 1898, March 12, 1899; 

 Gainesville, April 7, 1881, March 22, 1885, March 31, 1886, April 1, 

 1887. The latest record of the sycamore warbler in spring south of 

 the United States is April 13, 1901, when it was observed on the north- 

 east coast of Yucatan. 



Mill ■migration. — In the fall the Mississippi Valley form is, like the 

 eastern, an early migrant, being one of the first birds to return in 

 autumn to the Rio Grande of Texas. It is recorded as arriving at 

 Orizaba, Mexico, August 10; Chiapas, Mexico, August 13; Colima, 

 Mexico, in August; Duenas, Guatemala, by the middle of August; 

 Bonacca Island," Honduras, and Truxillo,^ on the mainland, in Sep- 

 tember; and at San Jose, Costa Rica, October 1. In the northern 

 part of its range it lingers somewhat later than the eastern form. 

 The last to pass southward do not leave Indiana and Missouri until 

 well into October. 



664. Dendroica graciee Baird. Grace Warbler. 



The Grace warbler breeds in the mountains of New Mexico, Ari- 

 zona, and Chihuahua, Mexico, and retires for the winter into north- 

 western Mexico. Its northernmost extension is in southern Colorado, 

 where it occurs regularly in La Plata Count}^, breeding to 8,500 feet. 

 It has been taken in north central Colorado and southern California, 

 but its occurrence at these points is accidental. It is found in winter 

 as far south as Tepic and Jalisco. In Arizona spring arrivals have 

 been noted as follows: Fort Whipple, April 21, 1865; Pima Co., April 

 22, 1885; Huachuca Mountains, April 27, 1902, April 12, 1903. 



«Salvin, Ibis, p. 250, 1888. 



^Ridgway, Proc. U. S. Nat. Mus., X, p. 579, 1888. 



