BIEDS OF EGYPT. 301 



under tail-coverts white ; beak black, shaded with deep red 

 towards the base ; legs dusky red ; irides dark brown . 



Immature plumage. — Forehead, cheeks, and under surface 

 of the body white ; back, wings, and tail leaden grey inter- 

 mingled with brown. 



Entire length 10 inches ; culmen 1 ; wing, carpus to tip, 

 8 ; tarsus 0"7. 



Fig. Gould, B. of Eur. pi. 422. 



330. Hydrochelidon nigra (Linn.). White-vnngcd Black 



Tern. 



Von Heuglin (Syst. Ueb. p. 71) mentions this Tern as not 

 uncommon during winter and spring on the coasts of both 

 the Mediterranean and the Red Sea. 



Summer plumage. — Head, neck, scapulars, and chest black ; 

 rump, tail-coverts, tail, and vent white; wings grey, with 

 white edges to the shoulders ; outer primary nearly black ; 

 beak dusky black, tinged with red at the base ; legs red ; 

 irides dark brown. 



Entire length 9 inches ; culmen 1 ; wing, carpus to tip, 

 8-7 ; tarsus 0-9. 



Fig. Gould, B. of Eur. pi. 423. 



331. Hydrochelidon LEUCOPAREIA (Natt.). Whiskered Tern. 



This is a very abundant species on the Nile, ranging 

 throughout Egypt and Nubia. I met with small flocks on 

 several occasions as far up as El Kab, and on the 1st of May 



