n8 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. IX. 

 PART 2. Upper mandible without notch or hook at tip. 



Bill, as illustrated; back, gray or 

 bluish gray; bill, over .50; nostrils, con- 

 cealed by bristly tufts ; tarsus, scutellate ; 

 tail feathers,, not stiff or pointed. 



Family SITTID^. Nuthatches. 

 See page 267. 



Bill, as illustrated; back, bluish gray; bill, 

 less than .50; size, small; length, less than 

 5.50; first primary, very short. 



Family SYLVIID^). 



Subfamily POLIOPTILIN^E. Gnatcatchers. 

 See page 270. 



Bill, as illustrated; throat, black ; nostrils, 

 concealed by tufts of bristly feathers. 



Family PARID^. Titmice, Chickadees. 

 See page 268. 



Bill, as illustrated; back, brown or brown streaked; tail feathers, 

 not sharp pointed; outer tail feathers, shortest; tarsus, scutellate; 

 first primary, short. 



Bill of Wren. 



Family TROGLODYTID^. Wrens. 



See page 262. 



