216 CALIFORNIA ACADEMY OF SCIENCES [Proc. 47H SER. 
The mockers of Barrington were not as inquisitive as their 
congeners on Chatham, which is inhabited. They were very 
amusing in their actions. I remember one in particular, an 
Indefatigable bird, which was prying into things around our 
camp and inadvertently jumped into a bed of live coals. It 
jumped out with great alacrity, much amazed and alarmed. 
Their tenacity of life was not great, being decidedly less 
than that of sandpipers and snipes, birds of about the same 
size. 
On Albemarle these birds have cats to contend with, in 
addition to the owls and rats common to so many of the 
islands. 
17. Dendrceeca petechia: JAMAICAN YELLOW WARBLER 
Abingdon, Albemarle, Barrington, Bindloe, Brattle, Cham- 
pion, Charles, Chatham, Culpepper, Daphne, Duncan, En- 
derby, Gardner-near-Hood, Hood, Indefatigable islands, islet 
off northeast James, James. Jervis, Narborough, Seymour, 
Tower, and Wenman islands. 
Abundant on none of the islands, yet generally distrib- 
uted over all of them, both large and small, these birds were 
usually seen singly. They were found from the rocks below 
the high tide line to the tops of the mountains. They were 
essentially birds of the arid and littoral regions, as can be 
seen by the number of islands in the list which have no moist 
region. In September, on Cocos Island, Costa Rica, where 
the climate is exceedingly humid, they were fairly common 
and a good many were noted feeding among the rocks along 
the beaches at low tide. 
On Charles they were as common in the humid region as 
in the arid. On Chatham they were seen in both the arid 
and the humid belts. On southeast Albemarle, in March and 
August, they were noted in the humid forested region as high 
as Santo Tomas. I did not note any in the humid region of 
James. On Iguana Cove Mountain, Albemarle, they were 
seen chiefly below the 300-foot elevation at the time of our 
visit in March. One old nest, and also one new one, was 
- seen at about 700 feet elevation. On the west side of Tagus 
Cove Mountain, Albemarle, they were pretty generally distrib- 
uted, the arid belt extending practically to the top of the 
