OF ARTS AND SCIENCES 87 



extends to about the middle of July, and the song is seldom 

 heard later in the month or during the remainder of the sum- 

 mer. In the early autumn many immature birds, more particu- 

 larly, are seen in migrating flocks of warblers. The only 

 October records are of one bird in 1905 on the first day and of 

 one in 1908 on the fourth day. Usually the species has disap- 

 peared a week or more before the end of September. 



151. Dendroica castanea. Bay-breasted Warbi^er. 



A not uncommon summer resident of mixed woodland or 

 forest in a few localities. In 1906, 1907, and 1908 four singing 

 males, presumably representing four nesting pairs, occupied the 

 lower portion of the fifty-acre piece of woodland on the High- 

 land. In the same j^ears ten, twelve, and eighteen singing 

 birds respectively were recorded in two separate localities on 

 the Cherry Mountain drive to and through Bretton Woods to the 

 base of Mt. Washington, one extending about a mile on the 

 Cherry Mountain road on the southern declivity, and the other 

 colony extending through about six miles of Bretton Woods. 

 In these localities the songs of Blackburnian Warblers are in- 

 variably heard with the songs of the Bay- breasts, the association 

 of these two species seeming to be very close. In 1909 twenty- 

 seven singing males were recorded in the same two localities on 

 June 25. In 1910 twenty-one were heard. Another colony, 

 occupying but a limited area, has been noted along the path 

 intoTuckerman's Ravine a half-mile above the Crystal Cascade. 

 This consisted, so far as noted, in 1905 of three singing males, 

 in 1906 of four, and in 1907 of eight. In other than these four 

 specified localities the species has scarcely been found in the 

 breeding season. 



Perhaps in seasons previous to 1905 the species was over- 

 looked in these localities. I was not aware of its presence. But 

 the records would also show that it increased in numbers season 

 by season after it was discovered until a maximum was attained 

 in 1909. There was some diminution of numbers in 19 10, but 

 this may have been incidental to the season merely, as man}'- of 



