94 PROCEEDINGS MANCHESTER INSTITUTE 



not infrequently has been heard. Some birds ahnost always 

 remain through the first week of October and in 1907 and 1906 

 were seen to the tenth and eleventh days respectiveh^ 



163. Wilsonia pusilla pusilla. Wilson's Warbler. 



A rare summer resident, but becoming less rare, and a. not 

 uncommon fall migrant. One colony has established itself in 

 a limited area along the turnpike in the valley bottom, keeping 

 mostly within an extent of less than a half mile. In 1905 I first 

 became aware that the species was breeding in Jefferson. On 

 May 31 of" that year the song was heard in this locality, and 

 again on June 7, from a single bird. On June 15 two were 

 heard singing, and the song was again heard on June 23 and 

 July I. On June 16, 1906, three singing males were located 

 here, and the song was heard also on June 21 and July 2. In 

 1907 and 1908 the same number was recorded. In 1909, on 

 June 14, five birds were heard singing, and on July i, eight 

 birds. In 1910 five were singing on June 9 and 20, and six on 

 June 27. 



It is quite possible that the species was resident here before 

 the season of 1905 ; but, if that be the case, it has been obtain- 

 ing a firmer hold during the six years of my observation, and it 

 would seem to be now well established as a regular summer 

 resident. That it may not have antedated 1905 as a resident 

 bird is not improbable, however, since previously to 1903 the 

 turnpike here ran through forest and the territory would not 

 have been suitable. Following general logging operations, fire 

 swept this region in 1903, laying it comparatively bare, and 

 second growth began to spring up. The locality chosen is 

 naturall}^ somewhat swampy and has become overgrown with 

 bushes and sprouts. The elevation of the haunt ma}' be about 

 iioo feet. On June 22, 19 10, the song was heard in another 

 piece of swampy second-growth, which also had been burned 

 over, about two miles from the original haunt. Here, therefore, 

 a pair would seem to have located somewhat removed from 



