218 ON BIRDS FROM THE NETHERLANDS, 
varied with pale cinnamon plumage, viz.: 7, shot 8 Sep- 
tember 1908, on the sandbank „de Hors” near Texel 
(wing 320, bill 29 mm.) and ©, shot 17 December 1908 
near Texel (wing 312, bill 30 mm.). Further two adult 
specimens in full plumage, both belonging to the pale- 
breasted phase, viz.: go’, shot 3 May 1909 in the Anna 
Paulownapolder, Noord-Holland (wing 350, elongated tail- 
feathers 233, bill 32 mm.) and ©’, shot 10 August 1909 
near den Helder (wing 3830, elongated tailfeathers 215, 
bill 31 mm.). 
Larus argentatus Brünnich. 
A clutch of three eggs of this gull, that I found on 
the dunes of Wassenaar, 18 June 1909, consisted of two 
normally coloured eggs and one, of which the ground- 
colour is heron-blue, minutely speckled with pale greyish 
and with a few large spots of dark olive-brown and black 
and some clouds of very pale greyish violet, especially at 
the broad end. All three eggs are of normal size. 
Larus minutus Pallas. 
Of this little gull I received the following specimens: 
ad. QQ, winter plumages, 1 December 1908, near Texel. 
young CQ, 3 December 1908, near Texel. 
ad. ©, winter plumage, 5 December 1908, near Texel. 
young o', 9 December 1908, near Texel. 
young ©’, 17 December 1908, near Texel. 
ad. ©, in full plumage, 8 May 1909, near Texel. 
ad. ©’, in full plumage, 12 May 1909, near den Helder. 
young ©’, 12 May 1909, near den Helder. 
young o', 23 May 1909, near Texel. 
Hydroprogne tschegrava (Lepechin). 
We purchased the skin of an adult specimen in nearly 
full plumage, shot in June 1908 by ternshooters on the 
Zuiderzee near Lemmer, province Friesland. This is the 
Notes from the Leyden Museum, Vol. XXXI. 
