Dafila acuta. July 27, 1911. The drake is getting a good many eclipse feathers in flanks, breast, and back. The brown of the head is still immaculate. August 14, 1911. The drake is changing still more, the brown of the head now being interrupted by pale sandy duff feathers. The neck, breast, flanks, and back are changing, and he has lost his long tail feathers. The female is getting new scapulars and inter- scapulars, while the lesser wing coverts are all very worn still. October 29, 1911. Starting to leave eclipse plumage which was not entire this year. Vermiculated feathers appearing in flanks, scapulars. One or two black under tail-coverts. New brown feathers in one patch on throat. Otherwise in eclipse. No new primaries. The female is in fairly fresh plumage with new primaries. November 19, 1911. There seems to be no perceptible change in the drake, although doubtless the new feathers are on the increase. December 10, 1911. The new primaries are just appearing in the good wing. At this stage they seem to have no protection from coverts, but appear as blue quill, apparently pulpy. Aside from the appearance of more scattered brown on the throat, there appeared to be no noticeable change in appearance or drift.