I 
206 BRITISH BIRDS. 
thefe birds only vifit us at uncertain feafons, or have 
hitherto paffed unnoticed among other Terns, we 
know not ; but believe that this has not yet been 
recorded as a Britilh fpecies/’ They generally 
make their appearance in the neighbourhood of 
Romney in Kent, about the middle of April, and 
take their departure in the beginning of Septem=» 
ber/^ 
