Family FRINGILLIDAE. 



Emberiza hortulana L. — Ortolan. 



(Plate 25, fig. a-c). 

 (Snouckaert: Avifauna Neerlandica, p. 20, No. 39). 



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: 



soft ash-blue; reddish u^hite. 



dark brown, sometimes with light reddish 

 brown penumbra (blotches with blurred 

 edges). The typical markings of eggs of 

 the Emberiza-genus are less prominent in 

 this species. 



20 X 15.5 millimetres. 



0.150 gram. 



not specially characterized. 



varying between short-compact and more 

 elongated. 



is built of dry parts of plants, usually lined 

 with hair. 



on the ground, under the shelter of a tree 

 or shrub, in dense vegetation; especially 

 in corn fields. 



5-6. 



May — June. 



about 14 days. 



