508 MR. p. L. SCLATER ON TUE [Jline 15, 



P. Z. S. 1870, p. 666). There are examples in several of the Con- 

 tinental gardens also, but I am not aware that they have bred in 

 any case. 



10. CvGNUS NiGRicoLLis (Gm.). Black-neckcd Swan. 



Cyr/nus nigricollis. Wolf, Scl. Zool. Sk. i. t. 48 ; Scl. et Salv. 

 P. Z.S. 1876, p. 370. 



Hub. Antarctic America. 



" The first importation of the Black-necked Swan was effected by 

 the exertions of Admiral Hornby. When this officer was in com- 

 mand on the Pacific station he succeeded in sending home at 

 different periods, to the late Earl of Derby, eight individuals of 

 this species, of which six were living at the disjiersion of the 

 Knowsley collection in 185 P. The present Earl of Derby pre- 

 sented a pair of these birds to Her Majesty the Queen, and the two 

 remaining pairs passed into the possession of the Zoological Societ}'. 

 They, however, for several seasons made no attempt at reproduc- 

 tion, and one of them having died, the apparent chance of continuing 

 the species depended on one pair. Fortunately, in the year 1857, 

 these not only made a nesf, as had been done in 1856, but hatched 

 out four young birds, which rapidly arrived at full size and colour, 

 and at the end of the autumn could scarcely be distinguished from 

 their parents. The same success occurred in 1 858, with the fortunate 

 and singular result that the four birds of 1 857 were all males, and the 

 birds of 1858 females." (Sclater and Wolf, Zool. Sketches, i. sub 

 tab. xlviii.) 



Since this was written (in 1861)numerous importations of the Black- 

 necked Swan have taken place, and the species may be considered com- 

 pletely established in Europe. We have eight examples of it now in 

 the Gardens. 



The subjoined list gives the dates of the hatchings. . 



Dates of Hatching of Black-necked Swans. 



F. Subfam. V. ANATIN^. 



Genus Dendrocycna^. 



Examples of the eight out of the ten known species of this genus 

 have been exhibited in the Society's Gardens ; but the only instance of 

 any one of them breeding took place in 1872, when a pair of Den- 

 drocycna fuha mated and two young ones were hatched. 



^ See Knovrsley Sale-list, p. 44. 



^ Tbia generic name being a compound of kukvo9, shonld clearly be written 

 thus, not I)cndvoci/gna, as usually speit. 



