LIFE HISTORIES OF XORTH AMERICAN WILD FOWL 301 



Columbia (Skeena River) and the central Mississippi Valley. Now 

 too rare everywhere to outline its range more definitely. 



Spring migration. — Average dates of arrival: Nebraska, March 

 16; South Dakota, April 2; Minnesota, Heron Lake, April 4; Sas- 

 katchewan, April 16 ; British Columbia, April 20, Late date of de- 

 parture: Arkansas, Helena, April 29, 1891; British Columbia, 

 Osoyoos, April 25. 



Fall migration. — Fall dates: Minnesota, Spicer, October 8, 1913; 

 Michigan, St. Clair Flats, November 20, 1875 ; Washington, Douglas 

 County, November 9, 1912; Colorado, Fort Collins; November 18, 

 1897, and November 25, 1915. 



Egg dates. — Arctic Canada: Five records, June 17 to July 9. 

 Alaska: One record, June 28. Alberta: One record, April 7. Da- 

 kota : One record, June 4. 



