Atrus obscura Lake Umbagog, Maine. 1889 Maine Sept. 2d S. Umbagog (Continued). Every evening, half an hour or so before sunset after sunset when the shades of night were falling, there was a regular flight of Black Ducks from the various little ponds, meadows, & coves where they had spent the day to a large marsh at Moon Point on the edge of the lake. In this marsh they came from every direction in flocks ranging from three or four to fifty or sixty five birds. After sweeping over the marsh a few times, they would alight in the grass & begin to flush & feed in the shallow water. They seemed to be unable to see well after it became dull of sight dark often flying within a few yards of me when I hearing as I was standing erect or even moving about. Sometimes the evening the report of a gun or the thump of a paddle against twilight the boat would cause them to take wing; at other times I have fired small shots & made much noise with the paddle within a few rods of a flock & immediately afterwards heard them still flushing and feeding. Certainly they are as a rule much less easily alarmed by both sight & sound in the evening than by daylight. It is singular that they do not desert this marsh. For years they have resorted to it each night through the autumn whenever the water has been at the proper height despite the fact that they have been incessantly persecuted there. They desert the place wholly however when the marsh is either perfectly dry or wholly submerged but they continue to fly over it & even there going in a N.E. direction to some other place which we are not yet discovered.