FAMir-Y MNIOrri.TIDAi:, 



decree of fleshiness is reached in the tongue of the Worm-catin<j; Waibleiv 

 where the entire orj^an is thick and fleshy, something like those of some Spar- 

 rows, and is not ciliated. AVe And the greatest development of bristles or cilia 

 in the Tennesee and Cape May Warblers, where the terminal portion of the 

 tongue is narrowed and cleft for at least ten hundredths of an inch in depth, 

 mid tlie bristles are about six hundredths of an inch in length. ( See Fig. 7 A). 



Tlie trachea is often slightly expanded near upper larynx, but becomes- 

 \\ idened and straight as it descends. Through a fusion of the brouchialis 

 with the broncho-trachealis muscles of the lower larynx, the singing muscles. 

 rue reduced to three pairs. ( See Fig. 7, B, i i, enlarged larynx of Kirtland's 

 Warbler ) . Occasionally, however, there is an indication of development of the 

 shorter bronchialis. 



The bronchial tubes are ralber short, the half rings varying in number 

 from eight or nine 1^ Maryland Yellow-throat ; to twelve or thirteen (Kirtland's- 

 Warbler. ) 



Fw. (5. 



Fr(i 



A, Stcwnaeh of Kirtiand's War- 

 b!ei'; B, Proventrieulus of same laid 

 open, enlarged; C, stomach of Great- 

 er Eal ama Yer.ow-thrort. D, pan- 

 creas 01 another specin-cu enlarged. 



A, tongne of Cape May Warbler; B, low- 

 er larynx of Kirt.and's Warbler; C, bron- 

 chial tube of same ; D, bronchial tube of Mary- 

 land Yel ow-(hroat. All figures enlarj ed. 



The vibrating, tympaniform membrane is short, occupying but a small 

 portion of the upper bronchial tube, extending over only about four or five half 

 lings and is thus somewhat triangular in foim. (See Fig. 7. A, lower larynx 

 of Maryland Yellow-throat, and C", Kirttand"s Warbler both enlarged : o is the 

 tyui])aniform membrane. ) 



The OS transvcsrale is present, but the semiluna membrane is either ab- 

 sent ( Kirtiand's Warbler) or but slightly developed ( Maryland Yellow-throat ) 

 lience, as we may ex]iect. with this limited amount of vibrating apparatus, 

 the songs of these birds are never very loud and varied, yet some of them are 

 exceedingly sweet, as in the Prairie Warbler, but some are very feeble, as in the 

 lUack-poUed Warbler. 



