OF ARTS AND SCIENCES. 121 



village street. Among the White Mountains, I have not ob- 

 served them above 2,000 feet. Often I have noticed that after 

 sunset or in the dusk of early morning, instead of the simple 

 "pe-a-wee," the last two syllables are repeated as a sort of re- 

 frain, thus: " pe-a-wce, a-wce" given again and again in the 

 twilight. I have also heard this variation on cloudy days, but 

 only occasionally. In the White Mountains a few birds remain 

 until well into September. 

 Dates : May 17 to September 17. 



146. Empidonax flaviventris Baird. Ye llow- bellied 

 Flycatcher. 



A common summer resident of the upper Canadian life area. 

 On the White Mountains it is a characteristicj bird of the moss- 

 grown, saturated forest of balsam and spruce, breeding in the 

 from about 3,000 to 4,500 feet. It is also occasionally seen at 

 lower altitudes in suitable outlying localities, and I have ob- 

 served a pair on July 20, 1899, at about 1,500 feet on Mt. Bart- 

 lett among some hemlocks. The birds may have bred not far 

 away, and acted as if young were near by. Both were heard to 

 utter the " pu-ee " note. At Lancaster, Mr. F. B. Spaulding has 

 found the nest of this bird, and records ('87) one with five fresh 

 eggs found on June 14, 1886, "near a low, swampy piece of 

 vvoods." North of the White Mountains, it is found in the 

 dense swampy woods, and was recorded about Lake Umbagog 

 by Mr. C.J. Maynard ('72). There are no recorded instances of 

 its breeding south of the White Mountains, but I am assured by 

 Mr. G. H. Thayer that he has found the bird in summer in a 

 certain forest swamp on Mt. Monadnock at an elevation of about 

 1,400 feet. On June 15, 1902, on Imp Mt. of the Carter range, 

 I heard one of these birds give a peculiar flight song, just after 

 sunset. It flew slantingly upward for some twenty feet and re- 

 peated a number of times alternately its ordinary " pu-ee" and 

 " killick." 



Dates : May 26 (Franconia) to August (September? ). 



147. Empidonax traillii aliiorum Brewst. Alder 

 Flycatcher. 



A rather common summer resident throughout the Transition 



