LARIDE—TERNS. 279 
cheeks, throat, under surface of wings and tail white, rest of 
under parts leaden-grey ; bill blood-red ; legs, toes, and mem- 
branes deep red; irides dark brown. Length 11°5 inches ; 
culmen 1°45 ; wing 9°2; tail 3°45 tarsus 0°9. 
Adult (Winter): Forehead, crown, and under parts 
white ; some streaks on hinder crown and neck black. 
Birds of the year: Crown, occiput, and ear-coverts 
greyish-black ; feathers of back, scapulars, and secondaries 
dark brown in’ the centre, barred and tipped with buff; tail- 
feathers grey, darker towards the tips, margined with white ; 
bill brown, reddish at base ; legs and feet flesh-colour. 
Distribution: Breeds in South-western Spain and in 
South-eastern Europe, also in Asia, from as far as Mongolia, 
and in Northern Africa. Winters in South Africa, and to the 
eastward has been found as far south as Australia. 
Habitat : Very similar to that of . migra and H/. leucoptera. 
Genus STERNA. 
GUELABLL LED: TERN: 
Sterna anglica Joni. 
Adult (Summer): Forehead, crown, and nape black ; 
hind neck greyish-white ; rest of upper parts pale ashy-grey ; 
beneath white ; 42/7 deep and powerful, entirely black, legs, 
feet and claws black. Length 14 to 15°5 inches ; culmen 1°5 ; 
wing 13; tail 5; tarsus 1°25. 
Adult (Wicter): Head white, streaked with grey and 
black ; a dark stripe through the eye and ear-coverts. 
Immature Birds: “The bill brown; head on the top 
dull white, varied with pale brown and dusky streaks ; on the 
ear-coverts a spot of greyish-black ; neck all round white: 
back, scapulars, and tertials orange-brown, spotted with darker 
brown ; wing-coverts ash-grey, tipped with pale orange-buff ; 
primaries pearl-grey ; tail but little forked ; chin, neck, and all 
the under surface of the body white ; legs and feet brown.” 
Distribution: Breeds on the Danish coast, in Spain, 
South-eastern Europe, and Northern Africa ; also occurs in the 
Indian, Nearctic, and Neotropical regions. 
Habitat : Sea-coast lagoons or marshes. Gregarious. 
