Family MOTACILLIDAE. 

 Anthus trivialis (L.) ») — Tree-Pipit. 



(Plates 33 and 34, fig. a— h). 

 (Snouckaert: Avifauna Neerlandica, p. 25, No. 52). 



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: 



greyish, reddish or bluish white; brownish; 

 bluish; ash-blue; greyish yellow; reddish. 

 In relevant literature mention is made in 

 two instances (in Denmark in 1898, and 

 in England in 1909) of a plain sea-green 

 set of eggs, of the tint of Saxicola oenanthe- 

 eggs. 



greyish, dark, or reddish brown ; red. 



20 X 15 millimetres; varying fairly consider- 

 ably in size. 



0.134 gram. 



presents no special characteristic. 



mostly compact. 



is built of vegetable materials, especially of 

 moss, and lined with some horsehair. 



on the ground in a little hollow, under the 

 shelter of grass or bushes. 



5, sometimes 6. Of each set all the eggs 

 invariably belong to one and the same type. 



May— July. 



about 13 days. 



^) See for this species the general observations respecting the Family. 



