234 ON BIRDS FROM THE NETHERLANDS. 
den Helder; two, 2 February Noordwyk; one, 5 February 
den Helder and one, 6 February Voorschoten near Leiden. 
Nucifraga caryocatactes macrorhynchos Brehm. 
The Siberian, slender-billed form of the nutcracker has 
been observed frequently in the autumn of 1911, specially in 
the month of October, in nearly all parts of our country. 
I received for the collection four examples, shot in the 
provinces Zuid-Holland, Friesland and Drente, all in October. 
As I have published in ,,Ardea”, the periodical of the 
Dutch Ornithological Society, vol. I, p. 22, also a specimen 
of the European, thick-billed nutcracker, Nucifraga caryo- 
catactes (L.), is shot in our country, the first one obser- 
ved here; this specimen was captured near Gendringen, 
province Gelderland, 7 October 1911. 
Calamodus aquatica (Gmelin). 
The aquatic warbler, as is known, is a very rare bird 
in our country. We did not possess a specimen shot in 
the Netherlands. I am glad to say, that we have now a 
fine series of this species, for 14 August I received 28 
specimens, perished at the lighthouse at Haamstede, province 
Zeeland, in the night of 12—13 August, and 20 and 23 
August I received at every time one further specimen, 
found dead resp. 19 and 22 August at the same place. The 
birds are partly in summerdress, partly already moulted ; black 
shaftlines on breast and sides of body are present in some 
examples, in birds in summerdress as well as in moulted birds, 
I hope that I shall be able to continue next year these 
annual reports, but I fear that the new law for protec- 
tion of birds in the Netherlands, which is passed by the 
Chambers now, will impede scientific study of native birds 
in such a manner, that it will be practically impossible 
to get the wanted material. 
Leyden Museum, 2 September 1912. 
Notes from the Leyden Museum, Vol. XXXIV. 
