LAND BIRDS. 



KEY TO FAMILIES. 



* GROUP 1. Birds having wings less tlian 1.75 inches long. 



Smallest of our birds; bill, very slender; primaries, 10; rectices, 

 10; feet, very small and weak. 



Family TROCHILIDiE. Humming Birds. 

 See page 169. 

 Tail, rounded; the outer feathers, shorter 

 than middle ones; first primary, less than 

 two thirds as long as third; second primary, 

 much shorter than third; tarsus, scutellate. 



Family TROGLODYTID^. Wrens. 

 See page 262. 



* GROUP 2. Birds having wings from 1.75 to 2.75 

 inches long. 



SECTION 1. First primary, less than half as long as thud. 



PART 1. Tip of upper mandible, with small but distinct hooic or notch. 



Toes, joined at base. Plain colored birds, usually greenish or 

 grayish, but often show a faint wash of yellow on under parts; tail, 

 always without white spots. 



-x 



Family VIREONID^. Vireos. 



See page 227. 



* For directions for measurement, see page 2 1 . 

 117 



