WHITE-WINGED BLACK TERN O15 
Adult female nuptial.—Similar in plumage to the male, 
except that the breast and abdomen are somewhat paler 
in colour. 
Adult winter, male and female.—Back of neck, forehead, 
throat, breast, and abdomen, white, showing some greyish 
barring. 
Immature, male and female.—Top of head, back of neck, 
back, and wings, greyish, splashed with brown ; tail faintly 
mottled with brown ; otherwise the plumage resembles that 
of the adult in winter. 
Brak. Black. 
FEET. Reddish-brown; toes only half-webbed. 
TIrRwDEs. Dark brown. 
AVERAGE MEASUREMENTS. 
TOTAL LENGTH re ads WES erin 
WING ses ee a pay ORO 
BEAK = 5 sem a eee 
TARSO-METATARSUS sf sae © (0; Ones. 
Eaa Meee ele ane 
Allied Species and Representative Forms.—H. surina- 
mensis, of blacker hue, and displaying white on the edge of 
the wing, is the American representative. 
WHITE-WINGED BLACK TERN. Aydrochelidon leucoptera 
(Schinz). 
Colowred Figures.—Gould, ‘ Birds of Great Britain,’ vol. v, pl. 
76; Dresser, ‘ Birds of Hurope,’ vol. viii, pls. 590, 591; 
Lilford, ‘Coloured Figures,’ vol. vi, pl. 2. 
The south-eastern counties of England yield the most 
records of this scarce and irregular visitor. It is generally 
met with when migrating northward in May and June, 
though a few birds have been obtained in autumn and early 
winter. 
The White-winged Black Tern has visited Norfolk, 
Sussex, Hants, Dorset, Devon, Cornwall, the Scilly Isles, 
Yorkshire, Durham, and Warwick. . 
