AMMODRAMUS. 



409 



g*. Bill smaller and more slender (usually less than .22, 

 and averaging only .21, deep at base). 

 A 1 . Paler and grayer, averaging more so than A. 

 sandwichensis ; length 4.75-5.90, wing 2.65- 

 2.90 (2.80), tail 1.95-2.30 (2.14), exposed cul- 

 men .37-.40 (.39), depth of bill at base .20- 

 .22 (.21), tarsus .75-.85 (.80). Eggs .75 X -55. 

 Hab. Western North America, except (in 

 general) Pacific coast ; breeding from Bocky 

 Mountain plateau north to the Yukon district 

 of Alaska, migrating south, in winter, to 



Mexico 5426. A. sandwichensis alaudi- 



nus (Bonap.). Western Savanna Sparrow. 

 A 2 . Darker and browner, averaging more so than A. 

 savanna, with the breast and sides usually 

 more heavily (sometimes more thickly) 

 streaked, the whole head often suffused with 

 yellow; wing 2.50-2.75 (2.65), tail 1.95-2.15 

 (2.02), exposed culmen .40-.43 (.41), depth of 

 bill at base .21-.25 (.22), tarsus .65-.80 (.79). 

 Eggs .75 X -56. Hab. Salt marshes about 

 San Francisco Bay, California. 



542c. A. sandwichensis bryanti Eidgw. 



Bryant's Marsh Sparrow. 



e 2 . Superciliary and median crown-stripes usually very indistinct 



(sometimes nearly obsolete) ; longer lower tail-coverts 



streaked with black (streaks rarely concealed). 



Similar to A. sandwichensis bryanti, but upper parts more 

 heavily streaked with black on a much more uniform 

 and more olivaceous brown ground, sides of head and 

 neck darker, anterior portion of superciliary stripe 

 duller, more olivaceous, yellow, lower parts more 

 thickly and heavily marked with black, wing and tail 

 shorter, and bill larger ; length about 5.00-5.25, wing 

 2.45-2.70 (2.58), tail 1.80-2.10 (1.97), exposed culmen 

 .40-.50 (.44), depth of bill at base .21-.25 (.23), tarsus 

 ,78-.85 (.82). Hab. Salt marshes of southern Califor- 

 nia, south to Todos Santos Island, Lower California. 

 543. A. beldingi Bidgw. Belding's Marsh Sparrow. 

 Culmen regularly curved from the base, without depression in middle 

 portion, the bill more swollen ; primaries exceeding secondaries by 

 less than length of exposed culmen ; upper parts indistinctly streaked 

 with darker. 

 d 1 . Bill from nostril .36, or more ; depth of bill at base .26, or more ; 

 general color above light brownish gray or grayish brown ; 

 52 



