26 FIELD KEY 



without 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 " b. 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, Swallows, 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 in. 



