GULL-BILLED TEEN 



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. 



BEAK. Blood-red. 



FEET. Vermilion-red; webs deeply incised (Fig. 52). 



IRIDES. Dark brown. 



EGGS. Pale green in ground-colour, varying to stone- 

 grey, blotched with brown and black : clutch, three. 



FIG. 52. LEFT FOOT OF WHISKERED TERN. Nat. size. 



TOTAL LENGTH ... 



WING 



BEAK 



TARSOMETATARSUS 

 EGG 



AVERAGE MEASUREMENTS. 



11 



n. 



0-9 



1-55 x 1-15 in. 



GULL-BILLED TERN. Sterna anglica (Montagu). 



Coloured Figures. Gould, ' Birds of Great Britain,' vol. v, pi. 

 74 ; Dresser, ' Birds of Europe,' vol. viii, pi. 585 ; Lilford, 

 ' Coloured Figures,' vol. vi, pi. 4. 



Montagu first identified this rare British visitor from a 

 specimen taken in Sussex. Subsequently several have been 



