448 



8 



side of the trachea, till the tube is about to enter the cavity in the keel ; they then quit that 

 part of the tube to be attached to the ascending portion of the curve, which they follow, ulti- 

 mately dividing into two slips, one of which, inserted upon the surface of the bone of divarication, 

 governs the length of the preceding flexible portion of the tube ; the other slip passes off down- 

 wards to be attached to the inner surface of the breastbone, anterior to the first rib." 



Yarrell (B. Birds, iii. pp. 205, 206) gives woodcuts showing the above-mentioned peculiarities 

 in the anatomical structure of this Swan. 



The food of Cygnus bewichi is said to differ in no respect from that of its ally the Whooper. 

 Beyond the particulars above given by Mr. Seebohm I find nothing trustworthy on record relative 

 to the nidification of this species. When at St. Petersburg some years ago, I was shown in the 

 Museum of that city several eggs of Bewick's Swan from Northern Eussia, which I was assured 

 had been sent with the head of the parent bird. One of these, which I obtained by exchange, 

 is dull yellowish white, rather rough in surface of shell, and measures 3^§ by 2^§ inches. 



As the difference in the coloration of the bill is one of the chief characteristics of this Swan, 

 I have deemed it best to figure the head only, and not the entire bird. 



In the preparation of the above article I have examined the following specimens: — 



E Mus. H. E. Dresser. 



a, <3 ad. Leadenhall Market, November 1874. 



E Mus. Brit. Reg. 



a, b, c, ad. Great Britain, d, ad. Amoy, China. 



E Mus. Cantab, 

 a, ad. Great Britain. 



