BLUE-WINGED TEAL. 117 
154; extent of wings 24; wing from flexure 7}; tail 274; bill along 
the ridge 2,4. Weight 103 oz. 
The young birds are similar to the female, but paler, and without 
the green speculum. 
In a male, the roof of the mouth is deeply concave, with a prominent 
. middle ridge, on which are a few blunt papille ; on the upper mandible 
are 50 lamelle, on the lower about 65 below, and 85 above. The 
tongue, 8 twelfths long, large and fleshy, has two rows of lateral bris- 
tles. The cesophagus is 83 inches long, 4 twelfths in diameter until 
the middle of the neck, when it enlarges gradually to half an inch. The 
proventriculus is 14 inch in length, with oblong glandules. The sto- 
mach is a strong roundish gizzard, 1 inch and 2 twelfths long, 14 inch 
broad ; its left muscle 7 twelfths thick, the right 63 twelfths ; its cu- 
ticular lining or epithelium of moderate thickness and longitudinally 
rugous. The intestine, 5 feet 1 inch long, varies in diameter from 3 
to 2 twelfths ; the cceca are 2 inches 10 twelfths long, cylindrical and 
rounded, their diameter 3 twelfths ; the cloaca globular. The contents 
of the stomach were gravel and seeds of plants. 
The trachea is 6 inches and 2 twelfths long; its diameter at the 
top 4 twelfths, at the middle 2 twelfths, at the lower part 31 twelfths. 
The inferior larynx is formed of three or four united rings, and has an 
irregular roundish bony expansion on the left side. The number of 
rings of the trachea is 98, of the bronchi about 25. The contractor 
muscles are large ; cleido-tracheales and sterno-tracheales. 
