Family SYLVIIDAE. 



Phylloscopus trochilus (L.) Willow-Wren. 



(Plate 56, fig. a-d). 

 (Snouckaert: Avifauna Neerlandica, p. 37, No. 85). 



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: 



creamy white, sometimes tinted slightly 

 reddish. 



light or dark rusty red. The markings mostly 

 consist of fine pale rusty red cloudlets; 

 sometimes, however, of larger dark rusty 

 red spots. A type more rarely met with 

 has a purer white ground colour and is 

 sparingly spotted in a darker shade than 

 usual; this type possesses more of the 

 character of collybita-eggs. 



15.3 >< 11.8 millimetres. 



0.07 gram. 



not specially characterized. 



ovoidal. 



consists of vegetable materials and material 

 spun by insects, lined with down (of plants), 

 hair and a profusion of feathers. (It is 

 more or less domed, with a hole in the 

 side in downward direction. 



as a rule on the ground, sometimes in a little 

 hollow, under the shelter of tall grass, thick 

 shrubs, etc. 



5—7, sometimes 8 (after-set: 5—6). 



May— July. 



about 13 days. 



