Family PARIDAE. 



Parus coeruleus L. — Blue Titmouse. 



(Plate 40, fig. a-d). 

 (Snouckaert: Avifauna Neerlandica, p. 30, No. 65). 



Colour of surface of shell; 

 Colour of spots: 

 Average dimensions: 

 Average weight of shell: 

 Texture of shell: 

 Shape : 

 Nest: 



Site of nest: 

 Number of eggs: 

 Breeding season: 

 Duration of incubation: 



milk-white. 



reddish brown, in light and dark shades. 



15.4 X 11.9 millimetres. 



0.07 gram. 



not specially characterized. 



ovoidal. 



consists of vegetable materials, feathers and 

 hair. 



in holes of trees, and in various other holes. 



7—12 (after-set: 6). 



May— beginning of July. 



about 13 days. 



