Family FRINGILLIDAE. 



Chrysomitris spinus (L.) — Siskin. 



(Plate 16, fig. a— c). 

 (Snouckaert: Avifauna Neerlandica, p. 13, No, 16). 



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: 



light blue. 



faint rust colour; dark brown. 



15.05 X 11.78 millimetres. 



0.088 gram. 



has no special characteristic. 



varying. 



consists of vegetable material, bound together 

 with spinning material of insects, and lined 

 with feathers, wool and seed down. 



mostly high up, in the tops of conifers ; 

 more rarely in alders and other broad- 

 leaved trees. 



5-6. 



end of April or beginning of May— June. 



about 13 days. 



