1208 U.S. NATIONAL MUSEUM BULLETIN 23 7 part 2 



Wyoming — Laramie, October 20 (average of 4 years, September 24). 

 Colorado — Denver, October 25. Saskatchewan — Eastend, September 

 26. Manitoba — Treesbank, October 4 (average of 23 years, Sep- 

 tember 22). North Dakota — Cass County, October 6 (average, Sep- 

 tember 26). South Dakota — Sioux Falls, September 24. Nebraska 

 — Holstein, October 19. Kansas — northeastern Kansas, October 19. 

 Minnesota — Minneapolis-St. Paul, October 5 (mean of 5 years, 

 September 15). Iowa — Sioux City, November 13 (median of 38 

 years, October 17). Illinois — Chicago, October 6 (average of 6 years, 

 October 4). Missouri — St. Louis, October 28. Mississippi — Saucier, 

 October 26. Massachusetts — Martha's Vineyard, November 10. 

 Maine — Castine, October 18. New York — Short Beach, November 

 19. Maryland — Libertytown, November 11. Alabama — Dauphin 

 Island, November 8. Florida — Lower Florida Keys, November 9; 

 Leon County, November 5. 



Egg dates. — Alberta: 12 records, June 5 to July 7. 



Mackenzie: 3 records, June 9 to June 15. 



Manitoba: 37 records, May 23 to July 13; 22 records, June 2 to 

 June 15. 



Michigan: 40 records, May 29 to July 24. 



Minnesota: 21 records, May 22 to June 13; 12 records. May 31 to 

 June 6. 



North Dakota: 21 records, June 1 to July 15; 10 records, June 7 

 to June 14. 



Ontario: 1 record, June 3. 



SPIZELLA BREWERI Cassin 



Brewer's Sparrow* 



PLATES 65 AND 66 



Contributed by Robert T. Paine 



Habits 



John Cassin discovered this drabbest of North American sparrows 

 in 1850 and named it in honor of the Boston physician and naturalist 

 Thomas Mayo Brewer. His recognition of the range as essentially 

 western North America remains unchanged, especially with the dis- 

 covery in 1925 in the Canadian Rocky Mountains of a montane race. 

 No other bird is more characteristic of the arid sage country of the 

 Great Basin and Pacific slopes, where Brewer's sparrow is often 

 abundant both as a migrant and resident. 



♦The following subspecies are discussed in this section: Spizella breweri brewen 

 Cassin and S. b. taverneri Swarth and Brooks. 



