BLUE-WINGED TEAL. 287 



Male. Width of mouth 5 twelfths; upper mandible very deeply concave, 

 with a median prominent line, which is papillate for half its length; the 

 lamellae of the upper mandible 55, projecting a little beyond the margin, of 

 the lower about ISO, and extremely inconspicuous. Tongue 1-|- inches long, 

 fleshy, deeply grooved above, with thin lamellate margins, the tip semi- 

 circular, thin, and horny. (Esophagus 6|- twelfths long, its width 4 twelfths, 

 at the lower part of the neck enlarged to 7 twelfths, then contracting to 3 

 twelfths; the proventriculus oblong, 5 twelfths in breadth. Stomach a 

 transversely elliptical, oblique gizzard, 1 inch 1 twelfth long, 1 inch 3 

 twelfths broad, its lateral muscles extremely developed, the right 6 twelfths, 

 the left 5 twelfths in thickness, the inferior muscle narrow and prominent, 

 as in all birds of this family; epithelium very dense, with two opposite con- 

 cave grinding surfaces. Intestine 3 feet 1\ inches, with 16 folds, its general 

 width only 1|- twelfths, enlarging here and there to 2 twelfths; cceca A\ 

 inches long, for 1^- inches 1 twelfth in breadth, enlarging to 3 twelfths, and 

 toward the extremity 2 twelfths. Rectum 2\ twelfths long, its width 2\ 

 twelfths. Right lobe of the liver 1 inch 5 twelfths, the other 1 inch 2 

 twelfths. 



Trachea 5 inches long, from 2\ twelfths to 2 twelfths in width, moderately 

 flattened, ending in a transversely elongated tympanum, projecting to the 

 left side, with a roundish thin bony prominence; its greatest breadth 8 

 twelfths, its length 3 twelfths; the rings rather broad, firm, 115, besides a 

 few blended with the tympanum. The muscles as usual. Bronchial half 

 rings 28 and 34. 



BLUE-WINGED TEAL. 



' Anas discors, Linn. 



PLATE CCCXCIIL— Male and Female. 



Is it not strange, reader, that birds which are known to be abundant on 

 the Saskatchewan river during the breeding season, and which have been 

 observed as far north as the 57th parallel, should also be found breeding at 

 nearly the same period in Texas? Stranger still it is that species should 

 proceed from certain points, or winter quarters, to both of the above-men- 



