observed during the Voyage of the ' Valhalla* GG9 



Chrysomitris yarrelli. — Several examples of this species were 



purchased alive in the market-place at Bahia, but they 



all died. I skinned two of them. 



From Bahia we sailed to South Trinidad Island, where 

 the sea was smooth, and we made a good collection, landing 



on two days. We obtained examples of tin; following 



species * : — 



GYGI8 crawfordi. 



Gyijis can (lulu, Saunders, P. Z. S. 1880, p. 1G3; id. Cat. 

 B. l'». M. \xv. p. 149. 



Gytjis alba Sharpe, Ibis, 1904, p. 217 (S. Trinidad). 



Gygis crawfordi^ Nicoll, Hull. 13. O. C. xvi. p. 102. 



This is the most abundant species on South Trinidad; 

 from the shore to the top of the island it was met with in 

 thousands. I obtained ten specimens: six males, four 

 Females, also a young alive, and one egg. 



Gygis crawfordi bird is a very distinct species, differing 

 from G. alba in the following particulars: Bill wholly black 

 (not hyacinth-blue at the base as in the latter) and much 

 more slender : the nostrils are situated nearer the forehead, 

 and the wing is also longer than in G. alba. 



Probably all examples of the White Tern from the Atlantic 

 are referable to this specie's, as a glance at the map will 

 shew how completely it is isolated. A few pairs breed on 

 Fernando Xoronha Island, and it has been also recorded 

 from St. Helena and Ascension as a breeding species, but is 

 not yet reported from the Cape of Good Hope (//. Stark &; 

 Sclater, Birds of S. Africa, iv. p. J 18j. Gygis alba, however, 

 ranges over the whole of the tropical portions of the Pacific 

 and Indian Oceans. 



1 fully agree with Dr. Hartert (Nov. Zool. v. p. 07) that 

 S parr man' 8 name Sterna alba should stand for the Common 

 White Tern, the Sterna Candida of Gmelin. Span-man's 



i'f. remarks above, p. 396. 



