36 FIELD KEY. 



c 2 . Length 12.25 inches; slim, brownish birds with 



long tails; flight short and noiseless; perch in a 



tree, not in an exposed position; note, tut-tut, 



cluck -cluck, and cozv-cow. 



YELLOW-BILLED CUCKOO, BLACK-BILLED CUCKOO, page 130. 



B. Back brownish, streaked. 



a. Crown rufous or chestnut without streaks. 



a 1 . Length 5.25 inches; bill black; a whitish line 

 over the eye; a familiar bird of lawns and door- 

 yards; song, a monotonous chippy-chippy-chippy. 

 CHIPPING SPARROW, page 90. 



a a . Length 5.70 inches; bill reddish brown, back 

 rufous or rufous-brown; wing-bars and eye-ring 

 whitish; haunts dry, bushy fields and pastures; 

 song, a musical, plaintive cher-wee, chcr-wee, cher- 

 wee, cheeo, dee-dee-dee-dee. 



FIELD SPARROW, page 91. 



a 3 . Length 5.90 inches; forehead black; crown and 

 wings chestnut-rufous; flanks pale grayish brown; 

 haunts marshes; song, a rapidly repeated weet- 

 weet-weet, etc SWAMP SPARROW, page 167. 



b. Crown not rufous or chestnut. 



b l . Length 6.75 inches; crown blackish, with a cen- 

 tral whitish stripe; throat white; breast gray; a 

 yellow spot before the eye; haunts in and about 

 thickets and bushy woodlands; song, a high, clear, 

 musical whistle; call-note, chink. 



WHITE-THROATED SPARROW, page 167. 



b 2 . Length 5.20 inches; bill slender; a white line 

 over the eye; tail carried erect; haunts reedy 

 marshes; call-note scolding; song rippling. 



LONG-BILLED MARSH WREN, page 56. 



