Family SYLVIIDAE. 



Locustella naevia (Boddaert) — Grasshopper- 

 Warbler. 



(Plate 64, fig. a-c). 

 (Snouckaert: Avifauna Neerlandica, p. 42, No. 99). 



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: 



white, tinged with very soft pink. 



reddish brown; at the thicker end deeper- 

 lying spots of a violet-grey appearance 

 sometimes occur. 



17.1 X 13.3 millimetres. 



0.095 gram. 



the granulation is of a different nature to 

 that of the other genera of the Family. 



oval. 



consists largely of broad blades of grami- 

 naceous plants; horsehair is sometimes 

 found in the lining. 



on or immediately above the ground in grassy 

 places where there are many shrubs, wil- 

 lowbushes, etc.; sometimes in clover and 

 grain fields. 



5-6. 



end of May-end of June. 



about 13 days. 



