250 ZOOLOGICAL RESEARCHES 



Sterna fluviatilis. 



Sterna Jluviatilis (Naum.), Dresser , Birds of Europe , VIII. 

 pi. 45. 



Sterna senegalensis (Sw.), Hartl. Orn. W. Afr. p. 255. 



Sterna hirimdo , Schl. Mus. P.-B., Sternae, p. 17. 



Sterna macroptera (Bias.), Boc. Orn. d'Ang. p. 510. 



Hab. Europe, whole of Africa. 



Collected, near Robertsport, Grand Cape Mount. 



An adult male in full breeding-plumage was shot on 

 the 26^^ of July, and four other ones, probably younger 

 birds, on the 2Qi^ of April, the 26^^ of July, the ISth 

 and 15tt of August. During the whole summer large flocks 

 of this Tern were seen near the bar-mouth , i. e. the uni- 

 ted mouths of the Grand Cape Mount-, the Marfa- and the 

 Sugary River. The younger specimens mentioned are white 

 underneath and on the front. Upper tail-coverts gray like 

 the back , lesser wing-coverts black , forming a black band 

 along the edge of the wing. Iris brown , bill black , red 

 near the base, feet red. 



Iris of the adult bird brown , bill coral-red , with black 

 point, utmost tip of both adult and young horny white, 

 feet coral-red. 



Hyd rochelt don nigra. 



Sterna nigra ^ Briss. Orn. VI. p. 211, pi. 20, fig. 1. 



Hydrochelidon nigra, Hartl. Orn. W. Afr., p. 256; — 

 Boc. Orn. d'Ang. p. 513. 



Sterna Jissipes et nigra, Schl. Mus. P.-B., Sternae , p. 29. 



Hab. Europe; West Africa till down to the Cape of 

 Good Hope. 



Collected near Robertsport (Grand Cape Mount). 



On the 15t5i of August I shot about 20 specimens out 

 of a large flock , near the already mentioned bar-mouth. 

 As they were all younger birds and wore a quite similar 

 plumage — I do not remember to have seen birds in full 



Notes from tlie Leyden Museum, Vol. VII. 



