317 
during a Cruise in the Caribbean Sea. 
Fregata aquila (Linn.). 
These birds were beginning to nest and were present in 
hundreds. I did not see a single example with a red gular 
sac during the two days we were at the Testigos, and I 
am inclined to think that this is only acquired by very old 
males. One of our officers told me that he had seen one. 
By far the greater number of birds hovering over the islands 
had the head black and the throat and thorax wffiite, with a 
pectoral band of brownish not meeting in the middle line— 
that is to say, they were either young males or young 
females; a lesser number had the head and neck white 
(fully adult females). 
Ceryle alcyon (Linn.). 
I saw several examples of this Kingfisher along the shores 
of the island. In my experience this bird seems to prefer 
salt to fresh water. There was no water in any of the 
watercourses on Testigo Grande when we visited the group. 
I have found this bird on Blanquilla Island, which is seventy 
miles from the mainland, and contains no streams, on Swan 
Island (ninety-eight miles from the coast), which is another 
streamless island, and again on the Cayman Islands. So far 
as my recollection goes, I have not met with it as a rule very 
far from the sea when exploring rivers, and its favourite 
resorts are the mangrove bushes which border their mouths, 
where the water is brackish or tidal. 
Chrysolampis moschitus (Linn.). 
Chrysolampis moschitus Salvin, Cat. B. Brit. Mus. xvi. 
p. 113 (1892) ; Sharpe, Hand-1, ii. p. 119 (1900). 
Three males and two females. 
I only found this pretty little Humming-bird on one of 
the smaller islands of the group. In April 1906 I found it 
very common on Blanquilla Island, but on two subsequent 
visits, one in January and the other in February, I failed to 
observe a single specimen. There can, therefore, be little 
doubt that this diminutive bird annually migrates over 
ninety-five miles of open sea, for Blanquilla is so small 
and the vegetation on which the bird feeds so uniformly 
