OF ARTS AND SCIENCES 95 



the original colony, and its choice may signif}^ a widening out 

 of the breeding territory. The species has not been located 

 elsewhere in Jefferson. On July 24, 1906, a male bird in song 

 was seen at the roadside on the Highland. As there was no 

 suitable nesting haunt near, I suppose he ma}^ have moved out 

 from breeding ground not distant. 



Mr. Spaulding, however, has found a pair located in a little 

 swamp in lyancaster in recent years, but, I believe, not so long 

 as the species has been resident in Jefferson. In 1908 he found 

 the young birds just out of the nest ; in 1909 a nest and eggs. 

 There was no nesting in this swamp in 1910, he states. 



As a migrant the Wilson's Warbler has been noted year by 

 year. Every season a number of birds have come under obser- 

 vation on the Highland, in the valley, and elsewhere. The 

 earliest appearances have been August 8 in 1904, August 12 in 

 1902, and August 14 in 1900 and 19'ui. The latest records have 

 been September 20 in 1906 and 1908, September 21 in 1903, and 

 September 28 in 1907, male birds all. 



164. Wilsonia canadensis. Canada Warbi^er. 



A common summer resident of damp thickets in the valley 

 and along the streams on the mountain sides up to rather high 

 altitudes, 3000 feet or more. It is a most persistent singer. The 

 song period extends to the end of August and early days of 

 September. A few individuals have sometimes been heard 

 singing beyond the middle of September. I know of no other 

 warbler whose song will be so likely to be heard dail}^ through- 

 out August. The species is rather abundantly located along 

 the South Branch and its tributaries up to the elevation of the 

 Jefferson Notch. Here on June 2, 1904, twenty-two individuals 

 were heard singing ; on June 29, 1905, twenty-one ; on June 2, 

 1906, eighteen ; on June 15, 1908, twenty ; and on June 4, 1910, 

 twenty-five. In the valle}^ at the foot of the Highland along a 

 half-mile stretch nine or ten singing males have often been 

 recorded. Three or four pairs occupy the fifty-acre piece of 

 Highland woodland in its border along the river. The latest 



