MASKED GULL. 
297 
In this species the dark colour of the head does 
not reach to the occiput, hut covers the forehead, 
region of the eyes and cheeks, and extends down- 
ward on the throat and fore part of the neck ; the 
hack of the head and neck, under parts and tail, pure 
white ; the mantle and wings pale grey ; the bill, 
legs and feet, according to Mr. Yarrell, are brown- 
ish red. In winter the dark colour of the head is 
lost, and, according to the author we have quoted, 
there are a few dusky grey lines on the crown and 
a small patch of dusky black under the eye, and 
upon or under the car-covers. Length fourteen 
inches and a half. 
Another species, which has not yet been dis- 
covered in Britain, was drawn and engraved, and 
stood as 
PLATE XXIII. 
before the mistake was discovered ; it is very closely 
allied to the last, and is a native of the coasts of 
Southern Europe ; we have thought it best to allow 
this to remain and exhibit the distinctions of the pale 
mantle and pure white quills when contrasted with 
