﻿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. Tydschr. Dierk. II, 1865, p. 296, 

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

 chives Neerl. Sc. ex. et nat. VII, 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. C/iaulelasmus strepera (L.). [Kbakeend]. 



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 9i ^ September 1905, Nieuwkoop. 

 adult cfi 17 November 1905, Nieuwkoop. 

 adult cf, 25 November 1905, Nieuwkoop. 

 adult cf, 31 August 1906, Leimuiden, Zuid-Holland. 

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

 adult 9i 9~November 1907, EUemeet on Schouwen, Zeeland. 

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

 adult cf? 11 February 1908, EUemeet on Schouwen. 

 adult cf, 21 August 1908, Nieuwkoop. 



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



On migration this species is exceedingly numerous, spe- 

 cially near the sea-shore. We purchased several examples 



Notes from, the Leyden IMuseura, Vol. XXX. 



