from the West Indies. ;")S ( J 



S. piscator seem to change from the wholly brown plumage 

 straight into the white adult plumage. 1 have examined two 

 or three specimens of Sula piscator from the Pacific and 

 Atlantic in the brown plumage w r ith white rump, tail, and 

 vent, and found them in all respects similar to the Cayman 

 birds ; several of my white specimens from Little Cayman 

 had some brown in the tail. Moreover, I have seen several 

 adult examples of S. piscator in the British Museum with 

 black gular sacs. This being so, I cannot see any grounds 

 for separating the Cayman Gannet as a distinct species. 



I may here make a few remarks on the difference of the 

 coloration of the soft parts in the sexes. I soon found 

 that I could at once tell to which sex any example of this 

 Gannet belonged by the coloration of the gular pouch ; 

 that is, in the adult stage and in birds in the brown 

 plumage with white tails, in which latter plumage they also 

 breed. 



The males can always be distinguished from the females 

 by their wholly black gular sac. In the female the centre 

 of the sac is pinkish grey. In the white adult plumage the 

 male only has green lores ; in the female they are blue. 

 The young in first plumage have the gular sac pinkish. As 

 the bird gets older the sides of the sac become black, which 

 gradually meets in the centre of the chin. 



As to the habits of this Gannet, Dr. Sharpe has described 

 them so fully (Bull. B. O. C. xiv. p. Go, 1904) that I have 

 little more to add. At the time of our visit nearly all the 

 eggs contained young, but we obtained two hard-set eggs, 

 which I managed to blow. 



Fregata aquila (Linn.). 



Fregata aquila Grant, Cat. xxvi. p. 443. 



The Larger Frigate-bird was fairly numerous near the 

 Gannetry on Little Cayman. 



There seems to be some difference in the size of these 

 birds from different localities. Those I shot at Little 

 Cayman are very large and have very long stout bills, but 

 some in the British Museum from the Atlantic are inter- 

 mediate in size between this species and Fregata minor. 



