430 LARIDAG 
wings are darker, and the black and grey on the primaries 
show a deeper shade. 
Adult female nuptial.—Similar to the male plumage. 
Adult winter, male and female.—Similar to the nuptial 
plumage, with perhaps the very faintest indications of grey 
streaks about the head and neck. In this respect it differs 
from the adult winter-plumage of the Herring-Gull. 
Immature, male and female-—Resembles the immature 
plumage of the Herring-Gull. 
Beak. Yellow, red at the angle; the colours being 
much brighter than those of the Herring-Gull. 
Frerer. Brilliant yellow. 
IrtpEs. Bright yellow; margin of eyelids, bright orange- 
red. 
Kees. Resemble those of the Herring-Gull. 
AVERAGE MEASUREMENTS. 
TOTAL LENGTH ... a ue 22o in. 
WING ne oe oe Pa wel less i 
BEAK Mee - oe. CO Omee 
TARSO- -METATARSUS see so > LEOh pas 
Allied Species and Representative Forms.—L. vege, from 
the East coast of Siberia, wintering in Japan and China, 
is grey on the back and wings, but darker in shade than 
either of the above Herring-Gulls. Its feet are flesh-colour. 
LESSER BLACK-BACKED GULL. Larus fuscus (Linneus). 
Coloured Figures.—Gould, ‘ Birds of Great Britain,’ vol. v, pl. 
56; Dresser, ‘Birds of Europe,’ vol. viii, pl. 603 ; Lilford, 
‘Coloured Figures,’ vol. vi, pl. 24. 
The Lesser Black-backed Gull, slightly smaller than the 
Herring-Gull, and of similar build, is easily distinguished in 
its mature plumage by its dark bluish-black wings ‘and back. 
From the great Black-backed Gull it can be identified by 
its much smaller size. It is in no wise as abundant on our 
shores as the Herring-Gull, and though resident in some 
