146 



AVIFAUNA 



vince Noord-Holland and a young male shot 26 November 

 1866 in the same province (241 — 7, 10 and 11). 



Hybrid between Dafila acuta (L.) X Mareca penelope (L.). 



We possess a male hybrid between these species, killed 20 

 January 1862 at Anjum, province Friesland, and presented 

 by the late Mr. H. Albarda (Schlegel, Cat. Anseres, Anas 

 acuta, n°. 19). This bird is described by the late van Wicke- 

 voort Crommelin in Ned. Tijdschr. Dierk. II, 1865, p. 296, 

 as a hybrid of the two named species, but later on (Ar- 

 chives Néerl. Sc. ex. et nat. YII, 1872, p. 135) he supposed 

 the bird to be a hybrid of Dafila acuta and Nettion crecca. 

 The late Albarda mentioned the bird in his » Aves Neerlan- 

 dicae" 1897, p. 110, as a hybrid of Mareca penelope and 

 Nettion crecca. The bird is however without doubt a hybrid 

 between acuta and penelope. 



47. Chaulelasmus strepera (L.). [Krakeend]. 



In former days this duck seems to have been more 

 common than at the present time ; it is still breeding here 

 in a few numbers and is also on migration not numerous. 



I received the following specimens : 

 adult 9? 6 September 1905, Nieuwkoop, Zuid-Holland, 

 young 9» 0> September 1905, Nieuwkoop, 

 adult cfi 17 November 1905, Nieuwkoop, 

 adult cf 1 , 25 November 1905, Nieuwkoop, 

 adult o 71 , 31 August 1906, Leimuiden, Zuid-Holland, 

 young 9, 29 August 1907, Zoeterwoude, Zuid-Holland, 

 adult 9i 9 November 1907, Ellemeet on Schouwen, Zeeland, 

 adult cT, 21 November 1907, Aalsmeer, Noord-Holland, 

 adult cT, 11 February 1908, Ellemeet on Schouwen, 

 adult (ƒ, 21 August 1908, Nieuwkoop. 



48. Mareca penelope (L.). [Smteist]. 



On migration this species is exceedingly numerous, spe- 

 cially near the sea-shore. We purchased several examples 



Notes from tlie Leyden Museum, "Vol. XXX. 



