JAN., 1909. BIRDS OF ILLINOIS AND WISCONSIN CORY. 121 



* GROUP 3. Birds having wings measuring from 2.75 to 3.25 

 inches long. 



SECTION 1. First primary less than half as long as third. 

 PART 1. A small but distinct hook or notch at tip of upper mandible. 



Bill, very slightly hooked; primaries 10, the first often very short; 

 toes, joined together at base. Plain colored birds, usually greenish or 

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

 always without white spots. Family VIREONID^C. Vireos. 



See page 227. 



PART 2. Tip of upper mandible, not notched or hooked. 



Bill, as illustrated ; back, brown ; 

 rump, with concealed white spots; 

 outer tail feathers, shortest; tarsus, 

 scutellate. 



Family TROGLODYTID^. Wrens. 

 See page 262. 



Bill, as illustrated; back, gray or 

 bluish gray; nostrils, concealed by tufts 

 of bristly feathers. 



Family SITTID^. Nuthatches. 

 See page 267. 



! For directions for measurement, see page 21. 



