KEY TO FAMILIES. 



LAND BIRDS. 



GROUP 1. 



Birds having wings less than 1.75 inches long.* 



( 1 . ) Smallest of our birds ; bill, very sleuder ; 

 primaries, 10; rectices, 10; feet, very small aud 

 weak. 



Family TROCHILID/E. Humming Birds. 



See page 199. 



(2.) Tail, rounded; the outer feathers, shorter thau mid- 

 lUe ones; first primary, less thau two tliirds as loug as third; 

 ■second primar)', mucli sliorter thau third; tarsus, scutellate. ^^° 



Family TROQLODYTID/E. Wrens, Thrashers, etc. 

 Subfamily TROGLODYTIN/E. Wrens. 



See page .312. 



GROUP 2. 



Birds having wings from 1.75 to 2.75 inches long.* 

 Section 1. First primary, less than half as long as third. 



Part I. Tip of upper mandible, witli small but distinct hook or notch. 



(1.) Toes, joined at base. Plain colored birds, usually greenish or giayish, but often 

 show a faiut wash of yellow on underparts; tail, always without wliite spots. 



Family VIREONID/E. Vireos. 



See page 171. 



For directions for measurement, see page viii. 

 (133) 



