KEY TO FAMILIES. 



LAND BIRDS. 

 GROUP 1. 



Birds having wings less than 1.75 inches long.* 



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

 " primaries, 10; rectices, 10; feet, very small and 

 weak. 



Family TROCHILIDXE. Humming Birds. 



See page 199. 



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

 dle ones; first primary, less than two thirds as long as third; 

 second primary, much shorter than third ; tarsus, scutellate. 



Family TROQLODYT1D/C. 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 1. Tip of upper mandible, with small but distinct hook or notch. 



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

 show a faint wash of yellow on uuderparts; tail, always without white spots. 





Family VIREONID/E. Vireos. 



See page 171. 



* for directions for measurement, see page viii. 

 (133) 



