Family MOTACILLIDAE. 



Motacilla alba L. White Wagtail. 

 Motacilla alba lugubris Temm. -^ Pied Wagtail. 



(Plate 30, fig. a-f). 

 (Snouckaert: Avifauna Neerlandica, p. 28, Nos. 60 and 61). 



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: 

 Remarks : 



bluish, greyish, or greenish white; rarely 



yellowish white- 

 dark ash-grey; greyish brown; those lying 



deeper are of a clear ash colour. 



20 X 15 millimetres. 



0.135 gram. 



not specially characterized. 



varying. 



is built of vegetable materials, lined with 

 hair, and sometimes with feathers. 



under tree-roots, bridges, thatched-roofs; in 

 hollow trees (especially in or on pollard 

 willows), wood stacks, holes in walls, etc. 



5 — 6, sometimes 7. 



April— July. 



about 14 days. 



M. alba and M. lugubris cannot be separated 

 either oologically or nidologically. 



