( 463 ) 



YELLOW-BREASTED WARBLER OR MARYLAND 



YELLOW-THROAT. 



Sylvia Trichas, Lath. 



PLATE XXIII. Vol. I. p. 121. Adult. 



ROSCOE'S YELLOW-THROAT. Sylvia Roscoe. 



PLATE XXIV. Vol. I. p. 124. Young. 



Not long after the publication of my first volume, I discovered the 

 error which I had committed in making the bird represented in my 

 tvpenty-fourth plate a new species, it being only the young of Sylma 

 Trichas of Latham. Of this I informed my friends Dr Bachman, Mr 

 Harris, and Dr Brewer, and afterwards the Prince of Musignano, 

 I have nothing to add to my account of the habits of the Maryland 

 Yellow-throat. It was found on the Columbia River by Dr Town- 

 send, several of whose specimens I have seen. I also found it in the 

 Texas in April. No mention is made of it in the Fauna Boreali- Ame- 

 ricana ; and I saw none in Labrador or Newfoundland. The eggs of 

 this species measure 5| eighths in length, by four and a half eighths, 

 and are rather pointed at the small end. 



The roof of the mouth is flat, posteriorly with two ridges, anteriorly 

 with a middle prominent and two very slight lateral ridges ; its width 

 3 twelfths. The tongue is 4^ twelfths long, sagittate and papillate at 

 the base, thin, concave above, tapering to a deeply slit and slightly la- 

 cerated point. The oesophagus is 1 inch 7 twelfths long, its greatest 

 width 2 twelfths. The stomach is rather small, elliptical, 4^ twelfths 

 long, 3^ twelfths broad ; its lateral muscles moderate, the lower very 

 thin ; the epithelium longitudinally rugous. The intestine is 5 inches 

 long, its greatest width 1 twelfth ; the cceca 1 twelfth long, and about 

 a third of a twelfth wide, their distance from the extremity 7 twelfths. 



The trachea is 1\ inch long, 1 twelfth broad at the top ; its rings 

 60 ; its muscles as usual. Bronchial ringfs 15. 



