BAY-BREASTED WARBLER. 75 



the valley of the Magdalena; at Remedies^' in the valley of the Cauea, 

 and at Bucaramanga'^ — all localities in the forest region at 2,000 to 3,000 

 feet altitude. In fall migration it has been secured at Bonda^ on the 

 north coast. West of Panama the records of its occurrence are 

 meager. It has been recorded once from Costa Rica,^^ as would be 

 expected from its occurrence in Veragua, Panama, close to the Costa 

 Rican boundary. It has been taken on the island of Ruatan,^ Hon- 

 duras, and was recorded by Sclater and Salvin from Guatemala.-^ A 

 specimen in the U. S. National Museum is marked as taken in Guatemala 

 by Taylor. The species was long regarded as a bird of Mexico on the 

 strength of a specimen recorded as taken by Sumichrast at Tehuantepec 

 City^ October 19, 1869. This specimen, which is still in the U. S. 

 National Museum, is really a specimen of D. striata. At the present 

 time there is no sure record of the occurrence of D. castanea in Mexico. 



Spring migration. — No consistent idea of the spring migration of 

 the bay- breasted warbler can be drawn from the scanty records of its 

 appearance in the southern United States. There are few or no dates 

 for April. During the first week of May the bird appears in the dis- 

 trict south of St. Louis and Washington, and thence, proceeding 

 leisurely northward, arrives on the average at Beaver, Germantown, 

 and Renovo, Pa., May 13; southeastern New York, May 8; central 

 Connecticut, May 15; central Massachusetts, May 16; southern Maine, 

 May 18; and St. John, New Brunswick, May 21. It was noted at 

 Pictou, Nova Scotia, May 23, 1895. The movement of the species 

 west of the Alleghenies is at about the same time, the average date of 

 the first seen at Chicago being May 5; in southern Wisconsin, Maj^ll; 

 in southern Ontario, May 12; at Ottawa, May 17, and at Aweme, 

 Manitoba, May 16. 



Fall migration. — The return migration of the bay-breasted warbler 

 begins in August. During six years of observation at Chicago the first 

 migrant was seen on the average on August 27, the earliest date being 

 August 13, 1896. Other early dates are September 7, 1903, at Beaver, 

 Pa., and August 26, 1887, at Englewood, N. J. Most of the migration in 

 the central part of the United States takes place during September, and 

 by October the bay-breasts have reached South America. Last migrants 

 have been noted at Aweme, Manitoba, August 22, 1901; Lanesboro, 

 Minn., September 15, 1889; Ottawa, September 16, 1888; St. John, 



« Sclater and Salvin, P. Z. S., p. 494, 1879; Sharpe, Cat. Birds Brit. Mus., X, p. 

 650, 1885. 



&Berlepsch, J. f. Orn., p. 282, 1884. 



^^ Allen, Bull. Am. Mus. Nat. Hist., XIII, p. 177, 1900; Auk, XVII, 367, 1900. 



^Zeledon, Proc. U. S. Nat. Mus., VIII, p. 105, 1885. 



^Salvin, Ibis, p. 249, 1888. 



/Sclater and Salvin, Ibis, p. 11, 1859. 



9^ Lawrence, Bull. Nat. Mus., No. 4, p. 15, 1876. 



