39 



Under parts with buff ; yellow on wing, 



Henslow's Spaeeow. 

 Under parts with buff ; no yellow, 



Lincoln's Sparrow. 

 gg. Not streaked beneath, 

 h. Crown without white. 

 i. Tail rounded, Swamp Sparrow. 



ii. Tail slightly forked. 



Bill pale reddish, Field Sparrow. 



Bill black and yellow. Tree Sparrow. 

 hh. Crown with white stripes. 



Throat white ; yellow line from bill to eye, 

 White-throated Sparrow. 

 Throat ash ; no yellow. 



White-crowned Sparrow. 



6. Bill not as above ; as long as head or longer and with corr 



ners of month sharply drawn down. 



A. Underparts with yellow or bright chestnut. 



a. Black crescent on breast ; tail feathers acute. 



Meadow Laek. 

 aa. Not as above. 



Rump more or less orange, Baltimore Oriole. 



Rump not orange. Orchard Oriole. 



B. Under parts without yellow or chestnut, 

 a. Length a foot or more. 



Iridescence not in distinct areas, Purple Grackle. 

 Iridescence in distinct areas, Bronzed Gracbxe. 

 aa. Length 10 inches or less. 



Bend of wing scarlet or else under parts streaked 

 with dark brown and white. 



Red-winged Blackbird. 

 Not as above. Rusty Blackbird. 



7. Bill not as above . 



A. Length over 7 inches. 



