206 



AVIFAUNA. 



a female hybrid between these two species. The bird resembles 

 Corvus corone, only the middle of the lower breast and of 

 the belly are dark grey; the wing measures 300 mm. 



293. Corvus corax L. [Raaf]. 



We received only one specimen, a young female, shot 1 1 

 August 1908 at Oegstgeest near Leiden. 



294. Corvus frugilegus L. [Roek]. 



The Museum received 29 specimens. On a country seat 

 at Oegstgeest in the neighbourhood of Leiden a large 

 number of rooks are nesting every year. In May 1907 

 several young ones were killed, among which there were 

 two specimeus, having a white chin and throat, and one 

 specimen having a white chin. In one of the first specimens 

 some of the feathers covering the nostrils are also white. 



At the same spot two breeding females were shot, one 

 April 17 th 1906, the other April 11 th 1907, which have 

 chin and throat totally feathered and also the nostrils 

 covered with feathers. In April 1905 and 1907 breeding 

 females with partially feathered throats and with covered 

 nostrils have been killed at the same place. 



295. Coloeus monedula (L.). [Kauw]. 



15 specimens. A male, shot 7 May 1891 at Vogelenzang, 

 Noord-Holland, has the inner primaries, the secondaries and 

 the greater coverts brownish (Coll. van Wickevoort Crora- 

 melin, 34 — 9). There are in the collection further 5 spe- 

 cimens with more or less white feathers in the plumage. 

 We don't possess pure albinos from our country. 



296. Nucifraga caryocatactes macrorhynchos Brehm. [No- 

 tenkraker]. 



We possess 26 specimen killed in the Netherlands, which 

 belong all to the thin-billed form. The dates are September 

 1844, September 1848, October 1859, September and October 



Notes from the Leyden Museum, "Vol. XXX. 



