1880.] 



SPECIES OF ANATID^. 



507 



Dates of Hutching of Trumpeter Swans. 



June 28th. 

 » nth. 



6. Cygnus bewicki, Yarrell. Bewick's Swan. 

 Cygnus minor, Gould, B. G. Brit. v. t. 10. 

 Hab. North Palsearctic Region. 



Bewick's Swan (represented in our series in 1878 and now by a 

 single bird) has never bred in captivity, so far as I know. Two were 

 sold at the Kuowsley sale in 1851. 



7. Cygnus davidi, Swinh. Pere David's Swan. 



Cygnus davidi, Swinh. P. Z. S. 1870, p. 430; David et Oust. 

 Ois. Chine, p. 494. 



Hab. Northern China. 



Only yet known by a single specimen at Pekin ! 



8. Cygnus atratus (Lath.). Black Swan. 

 Cygnus atratus, Gould, B. Austr. vii. t. 6. 

 Hab. Australia. 



The Black Swan is in the first list of living animals given in 

 the Council's Report for 1831 (p. \h). I find records of its having 

 hatched at the following dates, which are of interest, as showing 

 that there is much variation in this respect in an Antarctic species. 



Bates of Hatching of Black Swans. 



1837. May 16th. 

 ,, August 4th. 

 ,. . „ 8th. 



1838. September r2th. 



1839. August 11th. 



1840. April 10th. 



1841. „ 21st. 



1842. „ 21st. 



1843. March 20th. 



1844. April 16th. 



1846. March 31st. 



1847. October 24th. 



1848. April 10th. 



1849. „ 1st. 



„ October 4th. 



1850. March 21st. 

 „ April 14th. 



1851. March 2ud. 



1852. „ 26th. 

 1860. „ 29th. 

 1864. November Ilth. 



1877. March 31st. 



1878. „ 11th. 



The male Black Swan has also mated with the female Common 

 Swan and produced party-coloured hybrids. See Lord Derby's note 

 on this subject, P. Z. S. 1847, p. 97. 



9. Cygnus coscoroba (Mol.). Coscoroba Swan. 



Cygnus coscoroba, Gr. et Mitch. Gen. B. iii. t. 166 ; Scl. etSalv 

 P. Z. S. 1876, p. 371. 



Hab. Antarctic America. 



This beautiful Swan was first obtained by us in 1870 (see 



