Clangula clangula americana. Lake Umbagog, Maine. 1897. saw two fly in quick succession from this part of the trunk. May 30. On examining the tree from the opposite side next morning I found that it had at just this place a round, neat-looking hole quite large enough for a Whistler to enter and without doubt containing a nest and eggs. It is remarkable, however, that four birds should have circled together so many times about this tree, but at times two of them would go off leaving the other two to continue their gyrations. They were all silent most of the time but once or twice I heard the loud continuous call noted here last year. May 31. Watrous found a Whistler's nest this morning in a short maple stub where we broke open a nest containing eggs last year (I have photographs of the stub taken last spring). It had eleven eggs none of which were covered. This nest is within 30 yards of the one in the tall stub about which the four Whistlers were circling yesterday. I thought then that one bird which separated from the rest and swept low down through the stubs might have gone to this nest.