214 



AVIFAUNA OF 



THE NETHERLANDS. 



EXPLANATION OF PLATES. 



Plate 7. Hybrid between Fuligula fuligula (L.) X AyÜiia nyroca (Giildenstadt). 



Female, shot 8 September 1905 at Nieuwkoop. Seen from below and 

 from the side. 



Plate 8. Strix flammea L. Specimens with pure white undersurface. 



a, <ƒ, shot 3 9 October 1869 at Vogelenzang (Coll. van Wickevoort 

 Crommelin, 27—8). 



b, </, shot 11 December 1385 at Hillegom (Coll. van Wickevoort 

 Crommelin, 27—16). 



» 



Notes from the I^eyden Museum, Vol. XXX. 



