BIRDS OF THE BRITISH ISLES. 



99 



aquatic Warbler, 



THE Aquatic Warbler (Acrocephalus aquaticus, Gmelin) 

 is a very rare abnormal autumn migrant to the British 

 Islands, breeding in Central and Southern Europe from 

 the Atlantic to the Urals. It is supposed to winter in 

 Africa. The adult bears a close resemblance to the 

 sedge warbler (Acrocephalus phragmitis), but can readily 

 be distinguished from that bird by its having only two 

 broad, distinct, and conspicuous dark stripes on the crown, 

 and being less in size. 



