Artificial Key 15 



Under parts pure white; wings very long. Tree Swal- 

 low, (p. 91.) 



28. Throat ruby-colored. Ruby-throated Humming- 



bird, Male. (p. 141.) 



Throat white. Ruby-throated Hummingbird, Fe- 

 male, (p. 141.) 



IV. YELLOW OR ORANGE 



CONSPICUOUS EITHER AS MARKINGS, OR AS FORMING A LARGE 

 PART OF THE BODY COLOR. 



29. Rather large birds; distinctly larger than an English 



sparrow. Go to 30. 



Rather small birds; distinctly smaller than an English 

 sparrow. Go to 34. 



Bird about the size of an English sparrow ; small yellow 

 spot in front of each eye. White-throated Spar- 

 row, (p. in.) 



30. Upper parts largely black. Go to 31. 



Upper parts streaked with black, brown, and flaxen, some- 

 what like a sparrow's. Go to 32. 



Upper parts olivaceous or brown, not distinctly streaked. 

 Go to 33. 



31. Under parts black; yellow present only as the hind bor- 



der of a red shoulder patch. Red-winged Black- 

 bird, Male. (p. 127.) 



NOTE. The red feathers are sometimes displaced so that 

 the shoulder patch looks entirely yellow. 



Under parts mainly orange. Baltimore Oriole, Male, 

 (p. 124.) 



