200 Proceedings of the Boyal Physical Society. 



47. Stercorarius pomatorrhiniis (Temm.) — Pomatorrhine 

 Skua. — One seen in Lat. 32° S., Long. 16° E. 



48. Stercorarius catarrhactes, Linn. — Common Skua. — Seen 

 once or twice, but not common. 



49. Stercorarius antccrcticus, Less. — Antarctic Skua. — Fairly 

 common on the South African coast. A pair is frequently 

 seen in Algoa Bay, where they are in company with Larus 

 dominicanus. I have never seen them molest the latter, who 

 generally keep at a respectful distance. 



50. Larus canus, Linn. — Common Gull. — Plentiful near 

 Plymouth, but it does not appear to go far out to sea, as we 

 never see it after the first day out. 



51. Larus dominicanus, Licht. — Southern Black-backed 

 Gull. — Almost identical in size and plumage with Larus 

 fitscus, this species is very common in Algoa Bay and all 

 along the coast east of the Cape of Good Hope, but they are 

 seldom seen near Cape Town, where Larus hartlaubi takes its 

 place. They breed on St Croix, a small island in Algoa Bay, 

 and are said to destroy their eggs if their nests are disturbed. 



52. Larus argentatus, Gmel. — Herring Gull. — Common in 

 the Channel like the common gull ; it is also plentiful about 

 Madeira and the Canary Islands. 



53. Larus hartlaubi, Burch — Hartlaub's Gull. — Very com- 

 mon in Table Bay, where they come into the docks among 

 the shipping, and at night roost on the old hulks in the bay. 

 I have seen them on the east coast. 



54. Bissa tridactyla (Linn.) — Kittiwake. — A few of these 

 birds generally follow the ship between England and Madeira, 

 but south of that they disappear. 



55. Sterna fiuviatilis, E"aum. — Common Tern. — Large flocks 

 of a tern apparently of this species are frequently seen from 

 Cape Verde to the Bijouga Islands, generally fishing in com- 

 pany with other species. I have also seen flocks of them in 

 Table Bay, and round the coast as far as Cape Agulhas. 



56. Sterna caspia. Pall. — Caspian Tern. — I have seen one 

 at East London. 



57. ILydrochelidon nigra (Linn.) — Black Tern. — Not un- 

 common in the Tropics, where it is generally seen in com- 

 pany with other species. 



