MOURNING WARBLER 531 



remains until the end of April or May, sometimes delaying its depar- 

 ture until the middle of May. 



"Early dates of fall arrival in Central America are : Guatemala — 

 Panajachel (Griscom), September 20. Costa Rica — San Jose 

 (Cherrie), September 1, 1890; Eio Sicsola (Carriker), September 24; 

 Basin of El General, September 23, 1936 and October 4, 1942. 



"Late dates of spring departure from Central America are : Costa 

 Rica — Boruca (Underwood), April 27 ; Basin of El General, April 27, 

 1936, May 1, 1937, May 14, 1939, May 5, 1940, April 24, 1942 and April 

 29, 1943 ; San Jose (Cherrie) , April 27, 1890 ; Jejivalle, April 16, 1941. 

 Honduras — Tela, May 10, 1930. Guatemala — La Carolina (Gris- 

 com) , May 15." 



DISTRIBUTION 



Range. — Southern Canada and eastern United States south to north- 

 western South America. 



Breeding range. — ^The mourning warbler breeds north to probably 

 northeastern British Columbia (Fort Nelson and Dawson Creek) ; 

 central Alberta (Athabaska, Camrose, Nevis; probably: Grand 

 Prairie, Peace River, Egg Lake, and Fort MaclSIurray) ; probably 

 central Saskatchewan (Big River, Emma Lake, and Hudson Bay 

 Junction) ; Manitoba (Duck Mountain, Fairford, and Hillside 

 Beach) ; central Ontario (Kenora, Lac Seul, Missinaibi, Kapuskasing, 

 and Lake Abitibi) ; southern Quebec (Mistassini Post, Notre Dame 

 de la Doree, Val Jalbert, Cross Point, and Magdalen Island) ; and 

 Newfoundland (Nicholsville and probably Lewisporte). East to 

 Newfoundland (probably Lewisporte) ; central Nova Scotia (Wolf- 

 ville and Halifax) ; central western and southeastern Maine (An- 

 dover, Waterville, and Machias) ; central New Hampshire (Mount 

 Moosilauke) ; northwestern and central Massachusetts (Mount Gray- 

 lock and Princeton) ; southeastern New York (Kortright and Rox- 

 bury) ; northeastern Pennsylvania (Harvey Lake and Laanna) ; 

 western Maryland (Backbone Mountain) ; and eastern West Virginia 

 (Cheat Bridge, Cherry River Glades, Top of Allegheny, and Spruce 

 Knob). South to West Virginia (Spruce Knob); northwestern 

 Ohio (Spencer and Toledo) ; Michigan (Montcalm County and Lan- 

 sing) ; northeastern Illinois (La Grange Park) ; central and eastern 

 Wisconsin (Unity, New London, and Germantown) ; northwestern 

 and central eastern Minnesota (eastern Polk County, Leech Lake, 

 Gull Lake, and Isanti County) ; and central northern and northeastern 

 North Dakota (Turtle Mountains, Pembina, and Grand Forks). 

 West to central northern North Dakota (Turtle Mountains) ; southern 

 Alberta (Glenevis) ; and northeastern British Columbia (Fort 

 Nelson) . 



