In the juvenal plumage in August the head and neck are streaked with gray and whitish; the crown is dusky, with buffy edgings; the mantle is brownish black and dusky, with "tawny" edgings on the blackest feathers in the back and scapulars, and with pale buff or whitish edgings on the rest of the mantle and tertials; the under parts are white, suffused with pale buff on the throat, breast, and flanks; the wing coverts are edged with pale buff or whitish; the upper tail coverts are white and but little marked; the central tail feathers are dusky, edged with white, and the others are white, margined with dusky. This plumage is not worn long, for the postjuvenal molt of the body plumage begins late in August and lasts through September, producing a first-winter plumage. This is similar to the winter plumage of adults, but can be recognized by the juvenal wing coverts, some scapulars, and tertials. I have been unable to trace the first prenuptial molt of young birds, which is probably accomplished in South America, nor have I been able to recognize a first nuptial plumage. Possibly young birds may not come north during their first spring. Adults have a partial prenuptial molt in April and May, involving the body plumage, most of the scapulars, and some of the wing coverts and tertials. The complete postnuptial molt begins sometimes during the first week in July and sometimes not until the last of that month, and is completed in about two months, including the wings. A specimen taken in Argentina on September 21 had renewed the wings and practically all of the body plumage. In winter plumage the upper parts are brownish gray, with narrow, light edgings; the sides of the head and the under parts are white, with little or no barring; there is a dark streak through the eye, but no rusty on the head. _Food._--Audubon (1840) watched a flock of about 30 stilt sandpipers feeding, of which he writes: