323 



ANATIDJE. 



red, the membranes brownish-black. The whole length 

 twenty-one inches. From the carpal joint to the end of 

 the wing, nine inches and a quarter ; the first and second 

 primary quill-feathers of equal length, and the longest in 

 the wing. 



The female differs from the male in having the plumage 

 of dull brown, which is lightest in colour about the cheeks 

 and under surface of the body ; the beak dark olive ; the 

 feet greyish-brown. According to the descriptions given, 

 the trachea of the Surf Scoter resembles that of the Velvet 

 Scoter, as represented at page 318. 



The vignette below represents the difference in the ex- 

 tent of the membrane depending from the hind toe of 

 the two divisions of true Ducks : that on the left side 

 belongs to the first division, or Surface-feeding Ducks ; 

 that on the right to the second division, the Oceanic, or 

 Diving Ducks. 



