Birds of Heligoland. 11 



115. HyPOLAIS ICTERINA. 



Very rare, in May and August. 



116. Hypolais polyglotta. 

 One caught in May 1816. 



117. Hypolais omvetorum. 



A much damaged example, believed to have belonged to 

 this species, obtained in May 1860. 



118. Hypolais elaica. 



One shot in September 1883. 



119. Hypolais caligata. 

 One shot in September 1851. 



120. ACROCEPHALUS TURDOIDES. 



One shot half a century ago : two supposed to have been 

 seen since. 



121. AcROCEPHALUS ARUNDIXACEUS. 



Very rare, both in spring and autumn. 



122. ACROCEPHALUS PALUSTRIS. 



Rare in May and August. 



123. ACROCEPHALUS AGRICOLA. 



One shot in June 1864. 



124. AcROCEPHALUS PHRAGMITIS. 



Common from the end of March to the middle of May, 

 and again from the heginning of August to the beginning of 

 October. 



125. ACROCEPHALUS AQUATICUS. 



Very rare; seldom seen in spring. 



126. LOCUSTELLA CERTHIOLA. 



One shot in August 1856. 



127. LoCUSTELLA N.EVIA. 



Passes over in small numbers, principally in May and 

 August. 



128. LoCUSTELLA ELUVIATILIS. 



One shot nearly half a century ago, a second seen in ^lay 

 1874. 



