218 SYSTEMATIC CATALOGUE. 



are generally turbid. Frequents salt marshes near 

 the coast in the winter. 



Family HIRUNDINIM. 



SWALLOW, Hirundo rustica. Abundant. 



MARTIN, Hirundo urbica. Equally so. 



SAND MARTIN, Hirundo riparia. Almost un- 

 known in the weald of West Sussex, but common 

 to the south of that district. Most of the large 

 sandpits in the county are honeycombed by colo- 

 nies of these birds. It is rare among the Downs, 

 and of unusual occurrence on the maritime tract 

 between them and the sea. 



COMMON SWIFT, Cypselus apus. Provincial, 

 Screecher. Abundant. Arrives about the 1st of 

 May, and leaves us about the middle of August. 



Family CAPRIMULGID.E. 



NIGHTJAR or Fern Owl, Caprimulgus Europceus. 

 Partially distributed, being very common during 

 summer in the weald, as well as on open heaths 

 and gorse-covered commons, but of rare occur- 

 rence in more cultivated arid populous parts of the 

 county. 



