124 LONG-WINGED SWIMMERS. 



occiput, neck all around and below white. 

 Young, brown plumbeous above, white on 

 forehead and below with sides plumbeous. 

 Flight very light and graceful as it hovers 

 closely over water. Breeds in interior from 

 middle U. S., west of Alleghanies, northward 



Fig. 92 



Black Tern. 1-4. 



in May. South in May and Sept. when not 

 uncommon on coast of N. E. and near it ; 

 rare here in June. Winters in S. A.; north 

 in 



87. WHITE-WINGED BLACK TERN. 



Differs from above in having tail and 

 upper coverts white and wings whitish in 



