Dafila acuta. August 17, 1909. The drake Pintail is losing more of the brown feathers of his head; they are being replaced by dirty buffy feathers. The gray feathers on his neck continue to spread. Barred feathers are beginning to replace the vermiculated feathers of the flanks. August 29, 1909. The white line along the edge of the brown of the head of the male is disappearing, causing the head and neck to look a uniform brown or rather gray as the brown feathers are also disappearing. September 5, 1909. The lower part of the head of the drake and the lores are taking on the streaked appearance of the same parts in the females. October 16, 1909. At Dr. Clarke's to-day I saw Sprig drakes in all stages of the eclipse plumage just as shown in our collection at the Academy. October 27, 1909. About a week ago the drake Sprig died. His two long tail feathers had begun to appear although the rest of plumage showed little or no change: