Family MOTACILLIDAE. 



Motacilla boarula L. — Grey Wagtail. 



(Plate 31, fig. a-c). 

 (Snouckaert: Avifauna Neerlandica, p. 27, No. 59). 



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: 



whitish, yellowish greyish or greenish; 

 reddish brown. The ground colour is usually 

 lighter and slightly yellower or more 

 greenish yellow than that of flava-eggs. 



darker variegations of the ground colour 

 which, as a rule, inclines to a red-brown 

 more than is the case with /lava-eggs. 



19 X 14.5 millimetres. 



0.114 gram. 



bears no characteristic of its own. 



varying. 



is built of vegetable materials; the inside is 

 finished with much more care than that 

 of alba; lined with horsehair. 



by preference in the immediate vicinity of 

 water; in a little hollow on the banks of 

 brooks; in holes of walls covered with 

 vegetation. 



5, as an exception : 6 (after-set : 3—4). 



middle of April— July. 



about 14 days. 



