582 AxxALS OF THE Carnegie Museum. 



194. Dendroica aestiva. Yellow Warbler. 



Abundant as a summer resident, especially on the Peninsula, find- 

 ing congenial haunts in the many tracts of bushes and low shrubbery. 

 Mr. Simpson noted it in 1902 on April 26, but in 1900 the first was 

 observed April 30, and the next day it was common and musical. 

 Several nests were found the latter part of May, some containing eggs. 

 It was last seen August 31, being thus among the earliest species to 

 leave for the south. 



195. Dendroica caerulescens. Black-throated Blue Warbler. 



A spring and fall migrant, not very common, frequenting the 

 shrubby and wooded growths on the Peninsula, doubtless on the main- 

 land also. The first came May 7 in 1900, and it was seen at inter- 

 vals up to May 18. In the fall its migration was not so hurried, as it 

 extended from September 6 up to as late as October 2. It was if any- 

 thing more numerous at the latter season. Mr. Bacon's earliest spring 

 note is May 7 (1893) — the same as our own — while Mr. Sennett's 

 collection contains specimens taken as late in the month as May 18 

 (18S9) and 20 (1875). The second and third week in May include 

 practically all the available spring records. 



196. Dendroica coronata. Yellow-rumped Warbler. 



A common winter resident and abundant transient. We were some- 

 what surprised to meet with this warbler in considerable numbers at 

 the commencement of our work (March 21), associated with Black- 

 capped Chickadees and Golden-crowned Kinglets, haunting the 

 growth of pines and shrubbery near the north lighthouse, where there 

 was shelter from the wind. They proved unusually shy and difficult 

 to obtain, but such specimens as were secured were just entering upon 

 the prenuptial moult, and their fat was of a peculiar consistence, evi- 

 dently derived from the wax of the bayberry {Myrica Cai-oliiiensis), 

 which abounded in the locality, and upon which the birds were doubt- 

 less subsisting. There can be no reasonable doubt that they pass the 

 entire winter here, where there is such protection from the weather 

 and such a plentiful supply of food. The influx of transient individ- 

 uals from the south did not begin until about April 28, and the bulk 

 passed through the first week in May, when they were the most 

 numerous of the non -breeding warblers. None were seen after May 

 15. In the fall they reappeared September 18, becoming common in 

 about a week, thronging the shrubbery and bushes, and outnumbering 



