FAMILY SYLVIIDAE. 



Phylloscopus sibilatrix (Bechstein). — Wood- Wren. 



(Plate 55, fig. a-c). 

 (Snouckaert: Avifauna Neerlandica, p. 38, No. 86). 



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: 



dull white; frequently faintly bluish. 



dark yellowish or violet brown. The spots 

 are often elongated in the direction of the 

 length of the eggshell. A good character- 

 istic of the species consists in the circum- 

 stance that the pointed half of the eggshell 

 is spotted equally thickly as the basal portion. 



15.8 X 12.4 millimetres. 



0.07 gram. 



bears no special characteristic. 



mostly short oval. 



is built of vegetable materials, especially dry 

 leaves, and is sometimes lined with hair. 

 (It has its hole in the side). 



on the ground, by preference in beech and 

 oak woods. 



5-7. 



May— June. 



about 13 days. 



