EXPLANATION OF PLATE 9. 



Blue Bird, Sialia sialis ; 1 . tail : l', vii)per mandible ; 3, head. 



Blue-gray Gnatcatciier. Polioptila caerulea ; i. foot: Ti, tail: tl. head: 7, upper mandible; 8, 

 sternum. 



Ruby-crowned Wren. Regulus calendulus ; !.», tail. 



Chickadee, Parus atricapillus ; 10, sternum ; 11, upper mandible ; 12, head. 



Great Carolina AVren, Troglodytes ludoviciana ; 13, head; 14, upper mandible; 15, tail, 18, 

 foot. 



Worm-eating Warbler, Helmitherus vermivorus; 16, upper mandible; 17, head; 25, foot: 26, 



sternum. 



Crested Titmouse, Lophopiianes bicolor: 20, sternum; lU, tongue (twice life size); 21, upper 



mandible ; 22, head. 



White-bellied Nuthatch, Sitta carolinensis ; 23, sternum ; 24, tongue (twice life size). 



Blackburnian Warbler, Dendroeca blackburniae ; 27, head ; 28, upper mandible. 



Yellow-rumped Warbler, Dendroeca coronata ; 29, sternum. 



Long-billed Marsh Wren, Cistothorus palustris; 30, upper mandible ; 31, head ; 37, foot. 



House Wren, Troglodytes aedon; 32, sternum (A, side, B, front view). 



Tit-lark, Antuus ludoyicanus ; 33, foot ; 34, wing ; 35, head ; 36, upper mandible ; 38, sternum 

 * 

 (side and front view). 



