300 BULLETIX 17 9, UNITED STATES NATIONAL MUSEUM 



longed through much of September, the leisurely southward migra- 

 tion is in progress from Canada to northern South America. Alex- 

 ander F. Skutch has contributed the following notes : "Although the 

 olive-sided flycatcher is generally considered to be merely a bird of 

 passage through Central America, I have a few midwinter records 

 from the valley of El General in southern Costa Rica, and Carriger 

 cites a January record for the Cerro de Santa Maria, somewhat 

 farther to the north. Whether on migration or settled in its winter 

 home, this flycatcher is always solitary while in Central America 

 and never associates with others of its kind or joins in the mixed 

 flocks of small birds that attract each a single individual of certain 

 species that, during the winter months, are unsocial with respect to 

 their own kind. It is never abundant ; the greatest number of indi- 

 viduals that I have recorded in one day is six, seen on a 6-mile 

 journey from San Isidro del General to Rivas on September 13, 

 1936, when they had just arrived from the north. If it utters any 

 call while in the Tropics, I have so far failed to recognize it. The 

 olive-sided flycatcher arrives in Central America early in September 

 and sometimes delays its northward migration until the end of the 

 first week of May." 



DISTRIBUTION 



Range. — North and South America, from Alaska and Newfound- 

 land to Peru. 



Breeding range. — The olive-sided flycatcher breeds north to Alaska 

 (head of the North Fork of the Kuskokwim River and Circle) ; west- 

 em Mackenzie (probably Fort Norman, probably Fort Resolution, and 

 Fort Smith) ; northern Alberta (Smith Lodge and Fort Chipewyan) ; 

 northern Saskatchewan (Lake lie a la Crosse, Sandy Lake, and Cum- 

 berland House) ; Manitoba (Trout River) ; Ontario (English River 

 Post and North Bay) : Quebec (St. Margaret and Mont Louis) ; and 

 Newfoundland (Nicholsville and Base Camp). From this point the 

 range extends southward through the coniferous forests of the East 

 to eastern Pennsylvania (Hazelton and Pottsville) and western North 

 Carolina (Black Mountain and Highlands). South to southwest- 

 ern North Carolina (Highlands) ; eastern Tennessee (Mount Le- 

 Conte) ; northern Wisconsin (Kelley Brook) ; northern Mimiesota 

 (Gull Lake) ; central Colorado (St. Peters Dome and Crested Butte) ; 

 central Arizona (White Mountains and Flagstaff) ; and northern Baja 

 California (San Pedro Martir Mountains). The western boundary 

 extends northward along the coast from northern Baja California 

 (San Pedro Martir Mountains and Juarez Mountains) to Alaska 

 (Nizina River and the head of the north fork of the Kuskokwim 

 River) . 



