26 FIELD KEY 



zvitliout streaks or spots," and " B. Back brownish, 

 streaked." Your bird falls under "' B," where again 

 you have two subdivisions, " a. Crown rufous or chest- 

 nut, without streaks," and " h. Crown not rufous or 

 chestnut." Your bird should be referred to " a," 

 where you will at once find it described under " a " 

 as the Chipping Sparrow. 



FIRST GROUP. 



BIRDS THAT CATCH THEIR INSECT FOOD IN THE AIR. 



(Flycatchers, Swallozvs, Swift, Nighthawk, Whip-poor-will.) 

 I. Size large, length over 9.00 inches; the spread 

 wings over 15.00 inches in extent; generally seen 

 only late in the afternoon or at dusk. 



1. A bird of the air, flying high, often over housetops in 

 cities; a conspicuous white spot in each wing; note, 

 a loud, nasal peent ; sometimes dives earthward with a 

 booming sound Nighthawk, page 120. 



2. Haunts, near the ground, makes short flights while feed- 

 ing; call, given from a rock, stump, or similar perch, 

 whip-poor-will, vigorously repeated. 



Whip-poor-will, page 119. 



II. Size smaller, length under 9.00 inches'; the spread 



wings less than 15.00 inches in extent; may be 



seen at any time of the day. 



I. Birds that catch passing insects by darting from a 

 perch, to which they afterward return. 

 A. Length 8.50 inches; upper parts blackish slate 

 color; tail tipped with white; occasionally attacks 

 Crows; note, an unmusical, steely chatter. 



Kingbird, page iii. 



