182 BULLETIN 17 9, UNITED STATES NATIONAL MUSEUM 



kind of dense, swampy thickets as in spring and can be seen only by 

 the most ardent observers who are willing to look for them in their 

 still, shady retreats. 



Taverner and Swales (1907) say that, in Ontario, "this species 

 seems to start on its southward migration about the middle of Aug- 

 ust," but, at Point Pelee, "others come in before the earlier arrivals 

 leave, and many linger until well into September." 



Winter. — In El Salvador, Dickey and van Kossem (1938) report 

 this flycatcher as "fairly common in fall, winter, and spring through- 

 out the Lower Arid Tropical Zone and, locally, in the lower edge 

 of the oak-pine association in the Arid Upper Tropical. Extreme 

 elevations are sea level and 3,600 feet. Dates of arrival and 

 departure are October 8 and April 30. 



"The yellow-bellied flycatcher, while confined to levels below 3,600 

 feet, was, during the proper seasons, fairly numerous and evenly 

 distributed. Although found in all sorts of woodland it shows 

 preference for thin, open undergrowth beneath heavy forest. * * * 



"It was noticeable that the winter population remained fixed, and 

 there was little or no local shifting once the winter quarters were 

 selected. Each individual had its own particular patch of shrubbery 

 where it could be seen or heard at all times of the day." 



DISTRIBUTION 



Range. — North and Central America east of the Rocky Mountains ; 

 accidental in British Columbia and Greenland. 



Breeding range. — The yellow-bellied flycatcher breeds north to 

 southern Mackenzie (probably Taltson River and Soulier Lake) ; 

 Ontario (north shore of Lake Superior) ; Quebec (Lake Timiskaming, 

 Lake Mistassini, Godbout, and Anticosti Island) ; and Newfoundland 

 (Port Saimders). East to Newfoundland (Port Saunders, Nichols- 

 ville, and 3-pond Barrens) ; Nova Scotia (Dartmouth) ; New Bruns- 

 wick (Grand Manan) ; Maine (Ellsworth and Auburn) ; southern 

 New Hampshire (Mount Monadnock) ; southeastern New York (Slide 

 Mountain) ; and northeastern Pennsylvania (Mount Pocono). South 

 to northern Pennsylvania (Mount Pocono) ; southern Ontario (prob- 

 ably London and Listowel) ; southern Wisconsin (Bark River and 

 Albion) ; northern Minnesota (Lake Itasca and Moose River) ; 

 southern Manitoba (probably Winnipeg, probably Portage la Prairie, 

 and Oak Lake) ; probably southern Saskatchewan (Johnston Lake) ; 

 and central Alberta (Edmonton and Glenevis). West to Alberta 

 (Glenevis, Belvedere, probably Lake Athabaska, and probably 

 Smith's Landing) and Mackenzie (probably Taltson River). 



Winter range. — During the winter season these birds appear to be 

 concentrated in eastern Mexico north to central Tamaulipas (Rio 



