GULL-BILLED TERN 379 
Immature, male and female.—Top of head and back of 
neck, blackish-brown; back and wings, mottled with brown ; 
tail, sparsely speckled and margined with light brown. 
Brak. Blood-red. 
FreEt. Vermilion-red; webs deeply incised (Fig. 52). 
IripEs. Dark brown. 
Kees. Pale green in ground-colour, varying to stone- 
grey, blotched with brown and black: clutch, three. 
Fie. 52.—LEFT FOOT OF WHISKERED TERN. Nat. size. 
AVERAGE MEASUREMENTS. 
TOTAL LENGTH ... a soy el Voie 
WING ae ne ne dy (Oe 
BEAK or ne tae Tae 
TARSO-METATARSUS sate nee O:9e-.. 
EGe Nay ore 1G ria 
GULL-BILLED TERN. Sterna anglica (Montagu). 
Coloured Figures.—Gould, ‘ Birds of Great Britain,’ vol. v, pl. 
74; Dresser, ‘ Birds of Europe,’ vol. viii, pl. 585; Lilford, 
‘Coloured Figures,’ vol. vi, pl. 4. 
Montagu first identified this rare British visitor from a 
specimen taken in Sussex. Subsequently several have been 
