KEY TO FAMILIES. 



LAND BIRDS. 



GROUP 1. 



Birds having wings less than 1.75 inches long.* 



^_^^_^ (1.) Smallest of our birds ; bill, very slender ; 



liihiiaries, 10; vectioes, 10; feet, very small and 

 Aveak. 



Family TROCHILID/E. Humming Birds. 



See page 199. 



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

 dle ones ; flist primary, less than two tliirds as long as third; 

 tlJte 'C j.y:] second primary, mueli sliorter tlian third; tarsus, scutellate. ^^^ 



Family TROQLODYTID^. Wrens, Tlirasliers, etc. 

 Subfamily TROQLODYTIN/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 1. Tip of upper mandible, with small but distinct hook or notch. 



(1.) Toes, joined at base. Plain colored birds, usually gieeuish or grayisli, liut often 

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



/- 



y 



Family VIREONID/E. Vireos. 



See page 171. 



* i'ur directions for m*? .isiirement, hk'C page viii. 

 (133) 



