LARIDJE. 361 



416. Sterna Cantiaca, Gmel. Sandwich Tern. 



Sterna cantiaca, Gould's Birds of Europe, pi. 415. 



,, „ Layard's Cat. No. 686. 



Stei-na Boysii, Chapman's Travels in S. Afr., App. p. 424. 



This is a common species at Walwich Bay, and occurs 

 in all parts of the coast between that locality and Table 

 Bay. 



It is easy to obtain, and is sometimes seen on the 

 lagoons of the south-west coast in immense flocks, 

 mingling with Sterna fluviatilis and other species. 



It utters short, harsh cries, especially when occupied 

 in fishing. 



The iris is dark ; the points of the mandibles are pale 

 yellow ; the remainder of the bill and also the legs and 

 toes are a shining black. 



417. Sterna fluviatilis, Naum. British Common Tern. 



Sterna hirundo, Gould's Birds of Europe, pi. 417. 

 Sterna DougaUi, Layard's Oat. No. 685. 



„ „ Chapman's Travels in S. Afr., App. p. 424. 



Sterna JhiviatUis, Sharpe & Dresser's Birds of Europe, pi. 45. 



This Tern is pretty common on many parts of the 

 south-west coast of Africa, though not so numerous as 

 the preceding species at Walwich Bay. 



The iris is dark brown ; the bill dark horn-colour, but 

 reddish brown near the base, and with the tips of the 

 mandibles light horn-colour*; the legs, toes, and webs 



• [The colour of the hill, as here described, is no doubt taken from a 

 specimen which was undergoing the seasonal change, the bill of this species 

 being black in winter, with light horn-coloured tips, and red during the 

 breeding-season, with black tips. — Ed.] 



