f 







WHITE-WINGED BLACK TEEN 375 



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. 



BEAK. Black. 



FEET. Eeddish-brown ; toes only half- webbed. 



IRIDES. Dark brown. 



AVERAGE MEASUREMENTS. 



TOTAL LENGTH ... ... ... 9'6 in. 



WING 8-5 



BEAK 1*25,, 



TARSO-METATARSUS 0'6 ,, 



EGG ... 1'45 X 1 in. 



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. Hydrochelidon leucoptem 



(Schinz). 



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

 76 ; Dresser, ' Birds of Europe,' vol. viii, pis. 590, 591 ; 

 Lilford, ' Coloured Figures,' vol. vi, pi. 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 W T hite-winged Black Tern has visited Norfolk, 

 Sussex, Hants, Dorset, Devon, Cornwall, the Scilly Isles, 

 Yorkshire, Durham, and Warwick. 



