AMERir.VN \V\RBT,ERS. 



3 



Warbler, (See Fi";. 4, B ) or somewhat rounded as in the Prairie Warbler. 

 Ki<^. 4, C, or considerably rounded as in the Maryland Yellow-throat and 

 allied species. See Fi^-. 4, I). 



The entire foot ( tarsus and toes is lar<!;est and stroiiLjest in the Ground 

 ^Varblcrs, ( Geothlypis ) smallest and weakest in the Parula Warblers, but the 

 toes are proportionately largest in the Black and White Cree])er ( See Fitr. .j : 

 A is the foot of the Maryland Yellow-throat : B. the foot of the Parula War- 

 hler ; and C of the Black and White Cree})er) . 



The typical sternum among the American Warljkrs, is one in which the 



Fig. 4. 



Fk 



TaUs of Warblers. A, NashviUe ; B, 

 Cape May : C, Prairie ; D, Maryiaud Yel- 

 low-Uiroat. 



A, foot of Maryland Yellow-throat ; B. 

 " Parula: C, foot of Black aid 

 ■White Creeper ; D, Tongue ol YeLow Red- 

 poll, enlarged. 



coracoid bones are about equal in length to the top of the keel, or a litti:' short- 

 er. The marginal indentations, are about equal in depth to the height of the 

 keel, the other characters agreeing quite clo.sely with the ordinary Passerine 

 sternum. (See Fig. 9, A, sternum of Kirtland's Warbler. } From this we find 

 the variation consists in the keel being proportionately higher, reaching its 

 maximum development in members of the genus Oporonis, l^ong-winged A\'ar- 

 blers, or proportionately lower, as in the Ground Warblers, in which genus the 

 coracoid bones are considerably lengthened, being longer than the keel. 

 Sec Fig. 9, B, sternum of the Maryland Yellow-throat. Thus the entire ster- 

 num is proportionately longer in this genus than in any other o{ the family 

 Avhich I have examined. 



The typical tongue of the group is thin and horny, slightly cleft at the 

 extremity which is provided with fine bristles, or cilia that extend somewhat 

 along their sides. (See Fig. 5, D, tongue of Yellow Red-poll Warl)ler en- 

 larged). Departures from this rule consists in a tongue which is more fleshy 

 at the base, becoming suddenly thin and horny at the tip, as in the Blue Yel- 

 low-back and Black-poll Warblers. It is rather more fleshy in the Yellow - 

 ruinped Warbler, but still thin at tlie ti]>, bifed and ciliated. The maximum 



